android remove preload app

get root permission

check which is target APK
pm path com.xxx.packagename

remount partition to let permission to be read/write
mount -o remount,rw -t yaffs2 /dev/block/mtdblk3 /system

we need get partition info from
cat /proc/mounts

android keycode

utf area code
android/external/icu4c/data/unidata/Blocks.txt