Ok so now I know boot.sh is never executed by bootmenu. It never showed any messages at all. It still only shows "starting boot.sh from immc2 (mmcblk0p2 ext3)" even by using the verbose one or the original one.(and yes I did chmod it)
Tried both INT_CARD and EXT_CARD just to make sure but both failed. Tried also specifying boot.sh on item file to absolute path like /home/boot.sh or /boot.sh but still failed