An improved version of https://gist.github.com/IntrovertedMage/d759ff214f799cfb5e1f8c85daab6cae (2-change-status-bar-color.lua) based on @sebdelsol user patch https://gist.github.com/sebdelsol/eba2e492473ac1f9e0ecb003d403b7de

2-customise-progress-bar-colour-gui.lua

-- based on https://gist.github.com/IntrovertedMage/d759ff214f799cfb5e1f8c85daab6cae and https://gist.github.com/sebdelsol/eba2e492473ac1f9e0ecb003d403b7de
-- Menu added in the Reader menu:
-- settings > Status bar > Progress bar > Thickness, height & colors > Read color
-- settings > Status bar > Progress bar > Thickness, height & colors > Unread color

local ReaderFooter = require("apps/reader/modules/readerfooter")
local ProgressWidget = require("ui/widget/progresswidget")
local BD = require("ui/bidi")
local Blitbuffer = require("ffi/blitbuffer")
local Geom = require("ui/geometry")
local Math = require("optmath")
local Screen = require("device").screen
local _ = require("gettext")
local UIManager = require("ui/uimanager")
local T = require("ffi/util").template

-- Somewhat empirically chosen threshold to switch between the two designs ;o)
local INITIAL_MARKER_HEIGHT_THRESHOLD = Screen:scaleBySize(12)

-- Settings
local Settings = {}

local function colorAttrib(read)
    return read and "fillcolor" or "bgcolor"
end
local function getStyle(thin)
    return thin and "progress_style_thin_colors" or "progress_style_thick_colors"
end

function Settings:init(footer)
    local function defaultColor(thin)
        ProgressWidget:updateStyle(not thin, nil, false) -- no object needed, since height is nil, do no set colors
        local read, unread = colorAttrib(true), colorAttrib(false)
        return {
            [read] = "#808080",
            [unread] = "#ffffff",
        }
    end

    self.footer = footer
    self.default = {
        [getStyle(true)] = defaultColor(true),
        [getStyle(false)] = defaultColor(false),
    }
end

function Settings:getDefault(thin, color_attrib)
    local default = self.default[getStyle(thin)]
    return "#808080"
    -- return self.default[getStyle(thin)][color_attrib]
end

function Settings:get(thin, color_attrib)
    local settings = self.footer.settings and self.footer.settings[getStyle(thin)]
    local color = settings and settings[color_attrib]
    return color or self:getDefault(thin, color_attrib)
end

function Settings:set(thin, color_attrib, color)
    local style = getStyle(thin)
    local settings = self.footer.settings[style] or {}
    settings[color_attrib] = color
    logger.dbg(settings or "hello")
    self.footer.settings[style] = settings
end

local original_init = ReaderFooter.init

function ReaderFooter:init()
    Settings:init(self)
    original_init(self)
    self.progress_bar:_setColors(self.settings.progress_style_thin)
end

local original_loadPreset = ReaderFooter.loadPreset

function ReaderFooter:loadPreset(preset)
    original_loadPreset(self,preset)
    self.progress_bar:_setColors(self.settings.progress_style_thin)
end

function ProgressWidget:_setColors(thin)
    local read, unread = colorAttrib(true), colorAttrib(false)
    self[read] = Blitbuffer.colorFromString(Settings:get(thin, read))
    self[unread] = Blitbuffer.colorFromString(Settings:get(thin, unread))
end

local orig_ProgressWidget_updateStyle = ProgressWidget.updateStyle

function ProgressWidget:updateStyle(thick, height, do_setcolors)
    do_setcolors = do_setcolors or do_setcolors == nil -- default: do_setcolors = trues
    orig_ProgressWidget_updateStyle(self, thick, height)
    if do_setcolors then self:_setColors(not thick) end
end

local function getMenuItem(menu, ...) -- path
    local function findItem(sub_items, texts)
        local find = {}
        local texts = type(texts) == "table" and texts or { texts }
        -- stylua: ignore
        for _, text in ipairs(texts) do find[text] = true end
        for _, item in ipairs(sub_items) do
            local text = item.text or (item.text_func and item.text_func())
            if text and find[text] then
                return item
            end
        end
    end

    local sub_items, item
    for _, texts in ipairs({ ... }) do -- walk path
        sub_items = (item or menu).sub_item_table
        if not sub_items then
            return
        end
        item = findItem(sub_items, texts)
        if not item then
            return
        end
    end
    return item
end

function ReaderFooter:_statusBarColorMenu(read)
    InputDialog = require("ui/widget/inputdialog")
    local color_attrib = colorAttrib(read)
    return {
        text_func =  function ()
            return T(read and "Read color: %1" or "Unread color: %1", Settings:get(self.settings.progress_style_thin, color_attrib))
        end,
        keep_menu_open = true,
        enabled_func = function()
            return not self.settings.disable_progress_bar
        end,
        callback = function(touchmenu_instance)
            local input_dialog
            input_dialog = InputDialog:new({
                title = "Enter color hex code for " .. (read and "read color" or "unread color"),
                input = Settings:get(self.settings.progress_style_thin, color_attrib),
                input_hint = "#FFFFF",
                buttons = {
                    {
                        {
                            text = "Cancel",
                            callback = function()
                                UIManager:close(input_dialog)
                            end,
                        },
                        {
                            text = "Save",
                            callback = function()
                                local text = input_dialog:getInputText()

                                if text ~= "" then
                                    if not text:match("^#%x%x%x%x?%x?%x?$") then
                                        return
                                    end
                                    local color = Blitbuffer.colorFromString(text)
                                    if not color then
                                        return
                                    end
                                    Settings:set(self.settings.progress_style_thin, color_attrib, text)
                                    self.progress_bar[color_attrib] = color
                                    touchmenu_instance:updateItems()
                                    self:refreshFooter(true)
                                    UIManager:close(input_dialog)
                                end
                            end,
                        },
                    },
                },
            })
            UIManager:show(input_dialog)
            input_dialog:onShowKeyboard()
        end,
    }
end

local orig_ReaderFooter_addToMainMenu = ReaderFooter.addToMainMenu

function ReaderFooter:addToMainMenu(menu_items)
    orig_ReaderFooter_addToMainMenu(self, menu_items)

    local item = getMenuItem(
        menu_items.status_bar,
        _("Progress bar"),
        { _("Thickness and height: thin"), _("Thickness and height: thick") }
    )
    if item then
        item.text_func = function()
            return self.settings.progress_style_thin and _("Thickness, height & colors: thin")
                or _("Thickness, height & colors: thick")
        end
        table.insert(item.sub_item_table, self:_statusBarColorMenu(true))
        table.insert(item.sub_item_table, self:_statusBarColorMenu(false))
    end
end

function ProgressWidget:paintTo(bb, x, y)
    local my_size = self:getSize()
    if not self.dimen then
        self.dimen = Geom:new({
            x = x,
            y = y,
            w = my_size.w,
            h = my_size.h,
        })
    else
        self.dimen.x = x
        self.dimen.y = y
    end
    if self.dimen.w == 0 or self.dimen.h == 0 then
        return
    end

    local _mirroredUI = BD.mirroredUILayout()
    -- We'll draw every bar element in order, bottom to top.
    local fill_width = my_size.w - 2 * (self.margin_h + self.bordersize)
    local fill_y = y + self.margin_v + self.bordersize
    local fill_height = my_size.h - 2 * (self.margin_v + self.bordersize)

    if self.radius == 0 then
        -- If we don't have rounded borders, we can start with a simple border colored rectangle.
        bb:paintRect(x, y, my_size.w, my_size.h, self.bordercolor)
        -- And a full background bar inside (i.e., on top) of that.
        bb:paintRectRGB32(
            x + self.margin_h + self.bordersize,
            fill_y,
            math.ceil(fill_width),
            math.ceil(fill_height),
            self.bgcolor
        )
    else
        -- Otherwise, we have to start with the background.
        -- Normally rounded but no rounded color support currently
        bb:paintRectRGB32(x, y, my_size.w, my_size.h, self.bgcolor)
        -- Then the border around that.
        bb:paintBorder(
            math.floor(x),
            math.floor(y),
            my_size.w,
            my_size.h,
            self.bordersize,
            self.bordercolor,
            self.radius
        )
    end

    -- Then we can just paint the fill rectangle(s) and tick(s) on top of that.
    -- First the fill bar(s)...
    -- Fill bar for alternate pages (e.g. non-linear flows).
    if self.alt and self.alt[1] ~= nil then
        for i = 1, #self.alt do
            local tick_x = fill_width * ((self.alt[i][1] - 1) / self.last)
            local width = fill_width * (self.alt[i][2] / self.last)
            if _mirroredUI then
                tick_x = fill_width - tick_x - width
            end
            tick_x = math.floor(tick_x)
            width = math.ceil(width)

            bb:paintRectRGB32(
                x + self.margin_h + self.bordersize + tick_x,
                fill_y,
                width,
                math.ceil(fill_height),
                self.altcolor
            )
        end
    end

    -- Main fill bar for the specified percentage.
    if self.percentage >= 0 and self.percentage <= 1 then
        local fill_x = x + self.margin_h + self.bordersize
        if self.fill_from_right or (_mirroredUI and not self.fill_from_right) then
            fill_x = fill_x + (fill_width * (1 - self.percentage))
            fill_x = math.floor(fill_x)
        end

        bb:paintRectRGB32(
            fill_x,
            fill_y,
            math.ceil(fill_width * self.percentage),
            math.ceil(fill_height),
            self.fillcolor
        )

        -- Overlay the initial position marker on top of that
        if self.initial_pos_marker and self.initial_percentage >= 0 then
            if self.height <= INITIAL_MARKER_HEIGHT_THRESHOLD then
                self.initial_pos_icon:paintTo(
                    bb,
                    Math.round(fill_x + math.ceil(fill_width * self.initial_percentage) - self.height / 4),
                    y - Math.round(self.height / 6)
                )
            else
                self.initial_pos_icon:paintTo(
                    bb,
                    Math.round(fill_x + math.ceil(fill_width * self.initial_percentage) - self.height / 2),
                    y
                )
            end
        end
    end

    -- ...then the tick(s).
    if self.ticks and self.last and self.last > 0 then
        for i, tick in ipairs(self.ticks) do
            local tick_x = fill_width * (tick / self.last)
            if _mirroredUI then
                tick_x = fill_width - tick_x
            end
            tick_x = math.floor(tick_x)

            bb:paintRect(
                x + self.margin_h + self.bordersize + tick_x,
                fill_y,
                self.tick_width,
                math.ceil(fill_height),
                self.bordercolor
            )
        end
    end
end
-- Settings
local Settings = {}

local function colorAttrib(read)
    return read and "fillcolor" or "bgcolor"
end
local function getStyle(thin)
    return thin and "progress_style_thin_colors" or "progress_style_thick_colors"
end

function Settings:init(footer)
    local function defaultColor(thin)
        local read, unread = colorAttrib(true), colorAttrib(false)
        -- ProgressWidget:updateStyle(not thin, nil, false) -- no object needed, since height is nil, do no set colors
        return {
            [read] = "#808080",
            [unread] = "#ffffff",
        }
    end

    self.footer = footer
    self.default = {
        [getStyle(true)] = defaultColor(true),
        [getStyle(false)] = defaultColor(false),
    }
end

function Settings:getDefault(thin, color_attrib)
    local default = self.default[getStyle(thin)]
    return self.default[getStyle(thin)][color_attrib]
end

function Settings:get(thin, color_attrib)
    local settings = self.footer.settings and self.footer.settings[getStyle(thin)]
    local color = settings and settings[color_attrib]
    return color or self:getDefault(thin, color_attrib)
end

function Settings:set(thin, color_attrib, color)
    local style = getStyle(thin)
    local settings = self.footer.settings[style] or {}
    settings[color_attrib] = color
    self.footer.settings[style] = settings
end

local original_init = ReaderFooter.init

function ReaderFooter:init()
    Settings:init(self)
    original_init(self)
    self.progress_bar:_setColors(self.settings.progress_style_thin)
end

local original_loadPreset = ReaderFooter.loadPreset

function ReaderFooter:loadPreset(preset)
    original_loadPreset(self,preset)
    self.progress_bar:_setColors(self.settings.progress_style_thin)
end

function ProgressWidget:_setColors(thin)
    local read, unread = colorAttrib(true), colorAttrib(false)
    self[read] = Blitbuffer.colorFromString(Settings:get(thin, read))
    self[unread] = Blitbuffer.colorFromString(Settings:get(thin, unread))
end

local orig_ProgressWidget_updateStyle = ProgressWidget.updateStyle

function ProgressWidget:updateStyle(thick, height, do_setcolors)
    do_setcolors = do_setcolors or do_setcolors == nil -- default: do_setcolors = trues
    orig_ProgressWidget_updateStyle(self, thick, height)

    if do_setcolors and Settings then self:_setColors(not thick) end
end

local function getMenuItem(menu, ...) -- path
    local function findItem(sub_items, texts)
        local find = {}
        local texts = type(texts) == "table" and texts or { texts }
        -- stylua: ignore
        for _, text in ipairs(texts) do find[text] = true end
        for _, item in ipairs(sub_items) do
            local text = item.text or (item.text_func and item.text_func())
            if text and find[text] then
                return item
            end
        end
    end

    local sub_items, item
    for _, texts in ipairs({ ... }) do -- walk path
        sub_items = (item or menu).sub_item_table
        if not sub_items then
            return
        end
        item = findItem(sub_items, texts)
        if not item then
            return
        end
    end
    return item
end

function ReaderFooter:_statusBarColorMenu(read)
    InputDialog = require("ui/widget/inputdialog")
    local color_attrib = colorAttrib(read)
    return {
        text_func =  function ()
            return T(read and "Read color: %1" or "Unread color: %1", Settings:get(self.settings.progress_style_thin, color_attrib))
        end,
        keep_menu_open = true,
        enabled_func = function()
            return not self.settings.disable_progress_bar
        end,
        callback = function(touchmenu_instance)
            local input_dialog
            input_dialog = InputDialog:new({
                title = "Enter color hex code for " .. (read and "read color" or "unread color"),
                input = Settings:get(self.settings.progress_style_thin, color_attrib),
                input_hint = "#FFFFF",
                buttons = {
                    {
                        {
                            text = "Cancel",
                            callback = function()
                                UIManager:close(input_dialog)
                            end,
                        },
                        {
                            text = "Save",
                            callback = function()
                                local text = input_dialog:getInputText()

                                if text ~= "" then
                                    if not text:match("^#%x%x%x%x?%x?%x?$") then
                                        return
                                    end
                                    local color = Blitbuffer.colorFromString(text)
                                    if not color then
                                        return
                                    end
                                    Settings:set(self.settings.progress_style_thin, color_attrib, text)
                                    self.progress_bar[color_attrib] = color
                                    touchmenu_instance:updateItems()
                                    self:refreshFooter(true)
                                    UIManager:close(input_dialog)
                                end
                            end,
                        },
                    },
                },
            })
            UIManager:show(input_dialog)
            input_dialog:onShowKeyboard()
        end,
    }
end

local orig_ReaderFooter_addToMainMenu = ReaderFooter.addToMainMenu

function ReaderFooter:addToMainMenu(menu_items)
    orig_ReaderFooter_addToMainMenu(self, menu_items)

    local item = getMenuItem(
        menu_items.status_bar,
        _("Progress bar"),
        { _("Thickness and height: thin"), _("Thickness and height: thick") }
    )
    if item then
        item.text_func = function()
            return self.settings.progress_style_thin and _("Thickness, height & colors: thin")
                or _("Thickness, height & colors: thick")
        end
        table.insert(item.sub_item_table, self:_statusBarColorMenu(true))
        table.insert(item.sub_item_table, self:_statusBarColorMenu(false))
    end
end

function ProgressWidget:paintTo(bb, x, y)
    local my_size = self:getSize()
    if not self.dimen then
        self.dimen = Geom:new({
            x = x,
            y = y,
            w = my_size.w,
            h = my_size.h,
        })
    else
        self.dimen.x = x
        self.dimen.y = y
    end
    if self.dimen.w == 0 or self.dimen.h == 0 then
        return
    end

    local _mirroredUI = BD.mirroredUILayout()
    -- We'll draw every bar element in order, bottom to top.
    local fill_width = my_size.w - 2 * (self.margin_h + self.bordersize)
    local fill_y = y + self.margin_v + self.bordersize
    local fill_height = my_size.h - 2 * (self.margin_v + self.bordersize)

    if self.radius == 0 then
        -- If we don't have rounded borders, we can start with a simple border colored rectangle.
        bb:paintRect(x, y, my_size.w, my_size.h, self.bordercolor)
        -- And a full background bar inside (i.e., on top) of that.
        bb:paintRectRGB32(
            x + self.margin_h + self.bordersize,
            fill_y,
            math.ceil(fill_width),
            math.ceil(fill_height),
            self.bgcolor
        )
    else
        -- Otherwise, we have to start with the background.
        -- Normally rounded but no rounded color support currently
        bb:paintRectRGB32(x, y, my_size.w, my_size.h, self.bgcolor)
        -- Then the border around that.
        bb:paintBorder(
            math.floor(x),
            math.floor(y),
            my_size.w,
            my_size.h,
            self.bordersize,
            self.bordercolor,
            self.radius
        )
    end

    -- Then we can just paint the fill rectangle(s) and tick(s) on top of that.
    -- First the fill bar(s)...
    -- Fill bar for alternate pages (e.g. non-linear flows).
    if self.alt and self.alt[1] ~= nil then
        for i = 1, #self.alt do
            local tick_x = fill_width * ((self.alt[i][1] - 1) / self.last)
            local width = fill_width * (self.alt[i][2] / self.last)
            if _mirroredUI then
                tick_x = fill_width - tick_x - width
            end
            tick_x = math.floor(tick_x)
            width = math.ceil(width)

            bb:paintRectRGB32(
                x + self.margin_h + self.bordersize + tick_x,
                fill_y,
                width,
                math.ceil(fill_height),
                self.altcolor
            )
        end
    end

    -- Main fill bar for the specified percentage.
    if self.percentage >= 0 and self.percentage <= 1 then
        local fill_x = x + self.margin_h + self.bordersize
        if self.fill_from_right or (_mirroredUI and not self.fill_from_right) then
            fill_x = fill_x + (fill_width * (1 - self.percentage))
            fill_x = math.floor(fill_x)
        end

        bb:paintRectRGB32(
            fill_x,
            fill_y,
            math.ceil(fill_width * self.percentage),
            math.ceil(fill_height),
            self.fillcolor
        )

        -- Overlay the initial position marker on top of that
        if self.initial_pos_marker and self.initial_percentage >= 0 then
            if self.height <= INITIAL_MARKER_HEIGHT_THRESHOLD then
                self.initial_pos_icon:paintTo(
                    bb,
                    Math.round(fill_x + math.ceil(fill_width * self.initial_percentage) - self.height / 4),
                    y - Math.round(self.height / 6)
                )
            else
                self.initial_pos_icon:paintTo(
                    bb,
                    Math.round(fill_x + math.ceil(fill_width * self.initial_percentage) - self.height / 2),
                    y
                )
            end
        end
    end

    -- ...then the tick(s).
    if self.ticks and self.last and self.last > 0 then
        for i, tick in ipairs(self.ticks) do
            local tick_x = fill_width * (tick / self.last)
            if _mirroredUI then
                tick_x = fill_width - tick_x
            end
            tick_x = math.floor(tick_x)

            bb:paintRect(
                x + self.margin_h + self.bordersize + tick_x,
                fill_y,
                self.tick_width,
                math.ceil(fill_height),
                self.bordercolor
            )
        end
    end
end

On my Pocketbook Era Color I get the following message:
Error applying patch: ./patches/2-customise-progress-bar-colour-gui.lua
Not sure what the problem could be. Does Koreader have any logs I could check?

On my Pocketbook Era Color I get the following message: Error applying patch: ./patches/2-customise-progress-bar-colour-gui.lua Not sure what the problem could be. Does Koreader have any logs I could check?

Sorry, there were two slashes right at the end from copy and pasting, it should work now

I use the thick progress bar with chapter markers. Can there be a simplified version of this script that only changes the progress bar color to a hex value?

@HahBikes as opposed to what? What would only changing the progress bar colour to a hex do?

On my Pocketbook Era Color I get the following message: Error applying patch: ./patches/2-customise-progress-bar-colour-gui.lua Not sure what the problem could be. Does Koreader have any logs I could check?

Sorry, there were two slashes right at the end from copy and pasting, it should work now

Sorry to say but it doesn't. It now says No reader engine for this file or invalid file. when I try to open a book. Without the patch it works fine.

On my Pocketbook Era Color I get the following message: Error applying patch: ./patches/2-customise-progress-bar-colour-gui.lua Not sure what the problem could be. Does Koreader have any logs I could check?

Sorry, there were two slashes right at the end from copy and pasting, it should work now

Sorry to say but it doesn't. It now says No reader engine for this file or invalid file. when I try to open a book. Without the patch it works fine.

This means its running into an error while opening the reader.
Are you on the most recent stable build of KOReader
Is it with all types of documents or just some types.
Are you or did you in the past use a similar patch, if now disable all of them. If in the past, is there any value under progress_style_thin_colors or progress_style_thick_colors, if there are delete those as that could be leading to an errror.
Could you copy and paste the recent part of your koreader/crash.log file if none of the above works?

Hello! Thank you for this. I'd like to ask for some help since the color doesn't show when I change the status bar colors. I was wondering if I should be toggling something on to enable the status bar to display the color. I'm using a Kobo Libra Colour.

I tried using the hex code #ff0d59

Getting the same error. Tested on stable and latest nightly. I had previously used the one from sebdelsol.

progress_style_thin_colors or progress_style_thick_colors, if there are delete those as that could be leading to an errror.

Where can I find this?

Getting the same error. Tested on stable and latest nightly. I had previously used the one from sebdelsol.

progress_style_thin_colors or progress_style_thick_colors, if there are delete those as that could be leading to an errror.

Where can I find this?

settings.reader.lua

Hello! Thank you for this. I'd like to ask for some help since the color doesn't show when I change the status bar colors. I was wondering if I should be toggling something on to enab

What version of KOReader are you on, maybe I can help you better since I have a Kobo libre colour as well and it works fine on a recent nightly build on that device and it also seems to work on other devices recent stable builds from my point of view.

Is it in b&w for both the read and unread bar colours?
Could you try setting the progress bar to thick and see if the colour shows then?
I'm just asking these questions to help me with debugging.

Reinstalled koreader and it's fixed. Thanks

On my Pocketbook Era Color I get the following message: Error applying patch: ./patches/2-customise-progress-bar-colour-gui.lua Not sure what the problem could be. Does Koreader have any logs I could check?

Sorry, there were two slashes right at the end from copy and pasting, it should work now

Sorry to say but it doesn't. It now says No reader engine for this file or invalid file. when I try to open a book. Without the patch it works fine.

Could you test it again, I made a change to the patch and I think I found what was causing it.

Hello! Thank you for this. I'd like to ask for some help since the color doesn't show when I change the status bar colors. I was wondering if I should be toggling something on to enab

What version of KOReader are you on, maybe I can help you better since I have a Kobo libre colour as well and it works fine on a recent nightly build on that device and it also seems to work on other devices recent stable builds from my point of view.

Is it in b&w for both the read and unread bar colours? Could you try setting the progress bar to thick and see if the colour shows then? I'm just asking these questions to help me with debugging.

Hello! I appreciate the help. It's great that we have the same device!

1. I used the v2025.04, installed today using the "one-click" method found in this thread.
2. It's B&W for both read and unread bar colours.
3. Still B&W after setting it to thick.

I could try a reinstall tomorrow and see how it works out!

Hello! Thank you for this. I'd like to ask for some help since the color doesn't show when I change the status bar colors. I was wondering if I should be toggling something on to enab

What version of KOReader are you on, maybe I can help you better since I have a Kobo libre colour as well and it works fine on a recent nightly build on that device and it also seems to work on other devices recent stable builds from my point of view.
Is it in b&w for both the read and unread bar colours? Could you try setting the progress bar to thick and see if the colour shows then? I'm just asking these questions to help me with debugging.

Hello! I appreciate the help. It's great that we have the same device!

1. I used the v2025.04, installed today using the "one-click" method found in [this thread.](https://www.mobileread.com/forums/showthread.php?p=3797096)

2. It's B&W for both read and unread bar colours.

3. Still B&W after setting it to thick.

I could try a reinstall tomorrow and see how it works out!

I've just downgraded to the stable build on my kobo libre colour so it probably isn't that,
The only other possible problem I can think of is if you have any other user patches enabled that do something similar, if so you should probably disable those

Reinstalled koreader and it's fixed. Thanks

Just so you know the problem I think you were running into could be because you have koreader open a document on launch, this bug has now bee fixed

Thanks a lot, this was my pain point for a while — now it's easier to see the progress among chapter marks.

I just tested your latest version. I deactivated the two other patches I have currently in use although they have nothing to do with the progress bar and rebooted the whole reader. I also deactivated the function to open the last book on startup. And I still get the same error message. My Koreader version is 2025.04 (stable).

Here's the interesting part from the crash log:

5/30/25-22:12:35 INFO opening file /mnt/ext1/Books/Fantasy/Andrzej Sapkowski/Vorgeschichte zur Hexer-Saga/Vorgeschichte zur Hexer-Saga[2] - Zeit des Sturms (Vorgeschichte zur Hexer-Saga Buch 2).epub
05/30/25-22:12:35 INFO Inhibiting user input
[!] doShowReader coroutine crashed:
./ffi/blitbuffer.lua:2565: attempt to index local 'value' (a number value)
stack traceback:
./patches/2-customise-progress-bar-colour-gui.lua:387: in function '_setColors'
./patches/2-customise-progress-bar-colour-gui.lua:93: in function 'orig_ProgressWidget_updateStyle'
./patches/2-customise-progress-bar-colour-gui.lua:395: in function 'updateStyle'
frontend/apps/reader/modules/readerfooter.lua:586: in function 'original_init'
./patches/2-customise-progress-bar-colour-gui.lua:71: in function 'original_init'
./patches/2-customise-progress-bar-colour-gui.lua:374: in function 'init'
frontend/ui/widget/widget.lua:46: in function 'new'
frontend/apps/reader/modules/readerview.lua:131: in function 'addWidgets'
frontend/apps/reader/modules/readerview.lua:117: in function 'init'
frontend/ui/widget/widget.lua:46: in function 'new'
frontend/apps/reader/readerui.lua:136: in function 'init'
frontend/ui/widget/widget.lua:46: in function 'new'
frontend/apps/reader/readerui.lua:713: in function 'doShowReader'
frontend/apps/reader/readerui.lua:666: in function <frontend/apps/reader/readerui.lua:665>05/30/25-22:12:35 INFO Looking for plugins in directory: plugins

Reinstalled koreader and it's fixed. Thanks

Just so you know the problem I think you were running into could be because you have koreader open a document on launch, this bug has now bee fixed

It wasn't that. I think it had something to do with having used the sebdelsol previously.

Okay, after a complete reinstall of Koreader it works for me too now. Maybe @garlik82 is right and it has to do with whether or not one had sebdelsol's progress bar patch installed before. I had the patch installed some time ago but deleted it since. But maybe some remnants of that patch were still lingering somewhere and were responsible for the crash.

thansk for the great colour bar. But when i applied this FR for RTL document (For Example: Japanese Document) it seam to be confict with your patch: koreader/koreader#13382

Hello! Thank you for this. I'd like to ask for some help since the color doesn't show when I change the status bar colors. I was wondering if I should be toggling something on to enab

What version of KOReader are you on, maybe I can help you better since I have a Kobo libre colour as well and it works fine on a recent nightly build on that device and it also seems to work on other devices recent stable builds from my point of view.
Is it in b&w for both the read and unread bar colours? Could you try setting the progress bar to thick and see if the colour shows then? I'm just asking these questions to help me with debugging.

Hello! I appreciate the help. It's great that we have the same device!

1. I used the v2025.04, installed today using the "one-click" method found in [this thread.](https://www.mobileread.com/forums/showthread.php?p=3797096)

2. It's B&W for both read and unread bar colours.

3. Still B&W after setting it to thick.

I could try a reinstall tomorrow and see how it works out!

I've just downgraded to the stable build on my kobo libre colour so it probably isn't that, The only other possible problem I can think of is if you have any other user patches enabled that do something similar, if so you should probably disable those

Hi there! Apologies for the late reply, I had a long period where I was busy with work. I had another plugin, the original thin progress bar, enabled. Disabling that one solved the problem!