export kit=/sdcard/kit
export bin=/data/local/bin
export mnt=/data/local/mnt

export PATH=$bin:/usr/bin:/usr/local/bin:/usr/sbin:/bin:$PATH

busybox umount $mnt/dev/pts $mnt/proc $mnt/sys $mnt 
busybox losetup -d /dev/loop2
busybox losetup -d /dev/block/loop2