How to install Ubuntu Touch on Xiaomi Redmi 9A/9C (Draft)

ubuntu_touch_redmi_9a.md

Ubuntu Touch on Redmi 9A Installation (Linux)

1. Unlock bootloader
   https://www.getdroidtips.com/unlock-bootloader-redmi-9-redmi-9a/

2. Downgrade to android 10 (stock rom) by SP Flash Tool or Mi Flash Tool
   https://spflashtool.com/
   https://xiaomiflashtool.com/
   https://xiaomistockrom.com/
   

3. Download UB rom
   Dandelion in name for 9A. Another is 9C (Angelica)
   https://gitlab.com/ubports/porting/community-ports/android10/xiaomi-redmi-9c/xiaomi-angelica
   

4. Download Google platform-tools
   

5. Extract ub file and flash
   Turn off phone, hold "volume down" + "power" to get into fastboot mode or

adb reboot fastboot

Disable VerifiedBoot
https://www.mediafire.com/file/kvz7dsowp09sfb1/vbmeta_disabled.img/file

fasboot flash vbmeta [path to vbmeta_disabled.img]

fasboot flash vbmeta_system [path to vbmeta_disabled.img]

fasboot flash vbmeta_vendor [path to vbmeta_disabled.img]

Flash dtbo and boot

fastboot flash boot [path to boot.img]
fastboot flash dtbo [path to dtbo.img]

Flash system

# boot to fastbootd mode
fastboot reboot fastboot

# delete product partition to get space for system
fastboot delete-logical-partition product

fastboot flash system [path to system.img]

# Reboot to enjoy Ubuntu Touch
fastboo reboot

Troubleshoots

1. Linux doesn't recognize phone when boot to fastbootd mode ->> try to add udev rules https://wiki.archlinux.org/title/Android_Debug_Bridge#Adding_udev_rules

2. Loop boot at redmi logo --> need to flash vbmata. --> use mtkclient if you cannot boot to flashboot https://github.com/bkerler/mtkclient (python mtk w --loader [path to loader]/MTK_AllInOne_DA.bin --preloader [path to preloader]/preloader_k62v1_64_bsp.bin vbmeta [path to vbmeta]/vbmeta.img)

Hey, where is dtbo.img? There's only boot, recovery, and system

It's been a year since I wrote this guide, and now I don't own Redmi 9A anymore. Please join this or this chat group for help.