A shell script to elevate the framework user permission to root on jailbroken Kindle

RUNME.sh

#!/bin/sh

# A shell script to elevate the framework user permission to root on jailbroken Kindle
# So the "cannot open framebuffer" exceptions might be gotten fixed. (For example on KOReader)

# Usage:
# 1. Use USB to plug your Kindle device to computer
# 2. Copy this file to kindle root directory
# 3. Enter ;log runme on search bar and wait for rebooting if no error happens

col=0
row=16

prtxt() {
  if [ "$row" -ge 33 ]; then
    row=0
    # clear the display
    eips -c
  fi

  eips $col $row -h "$1"

  row=$((row + 1))
}

prtxt 'Try to modify rootfs to writable'
mntroot rw
if [ $? -ne 0]; then
    prtxt 'Failed. Probably you are not root.'
    return 0
else
    prtxt 'Succ.'
fi

cp /etc/passwd /etc/passwd_bak
if [ $? -ne 0]; then
    prtxt 'Make backup for passwd failed.'
    return 0
else
    prtxt 'Make backup for passwd succ.'
fi

sed -i 's/framework:x:9000:/framework:x:0:/' /etc/passwd
if [ $? -ne 0]; then
    prtxt 'Elevated failed.'
else
    prtxt 'Elevated succ.'
fi

# Sleep for 3 seconds before the logs are covered by UI.
sleep 3
#!/bin/sh

col=0
row=16

prtxt() {
  if [ "$row" -ge 33 ]; then
    row=0
    # clear the display
    eips -c
  fi

  eips $col $row -h "$1"

  row=$((row + 1))
}

prtxt 'Try to modify rootfs to writable'
mntroot rw
if [ $? -ne 0]; then
    prtxt 'Failed. Probably you are not root.'
    return 0
else
    prtxt 'Succ.'
fi

cp /etc/passwd /etc/passwd_bak
if [ $? -ne 0]; then
    prtxt 'Make backup for passwd failed.'
    return 0
else
    prtxt 'Make backup for passwd succ.'
fi

sed -i 's/framework:x:9000:/framework:x:0:/' /etc/passwd
if [ $? -ne 0]; then
    prtxt 'Elevated failed.'
else
    prtxt 'Elevated succ.'
fi

# Sleep for 3 seconds before the logs are covered by GUI.
sleep 3

# Reboot to take the modification into effect.
reboot