Download Busybox from: http://www.busybox.net/downloads/binaries/latest/
Select busybox-armv6l and save it
Open a command line terminal: CMD.EXE or Bash Terminal, etc.
Change directory to your download path and then follow the commands below:
adb push busybox-armv6l /data/local/busybox
adb shell
su
cd /data/local
chmod 755 busybox
./busybox
mount -o remount,rw /dev/block/mtdblock4 /system
mkdir /system/xbin
/data/local/busybox cp /data/local/busybox /system/xbin
/data/local/busybox cp /data/local/busybox /system/bin
cd /system/xbin
busybox --install .
mount -o ro,remount /dev/block/mtdblock4 /system
sync
reboot
Note: You should change the device name [/dev/block/mtdblock4] for yourself by running command: mount | grep system
