HOW-TO Installing busybox by hand

adb shell
su
mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system
exit
adb push busybox /sdcard
adb shell
cd /system
ls -al


You're pushing busybox to the phone rather than the SD card as the SD card is mounted noexec.

if the dir /system/xbin is not there:

/sdcard/busybox mkdir /system/xbin

then use busybox to install busybox

cd /sdcard
chmod busybox 755
busybox cp /sdcard/busybox /system/xbin/busybox
cd /system/xbin
chmod busybox 755
./busybox --install -s /system/xbin
rm /sdcard/busybox

Yes you're chmod'ing busybox twice.  This is to make sure the permissions work in the /system/xbin folder as well.

Then exit and reboot:

needed file:: busybox

Refer::http://forums.androidcentral.com