In order to use in on the device (use the attached busybox.tar)
$ tar -xvf busybox.tar
$ adb shell
# mkdir /data/busybox
# exit
$ adb push busybox /data/busybox
$ adb shell
# cd data/busybox
# ./busybox --install
# export PATH=/data/busybox:$PATH
$ tar -xvf busybox.tar
$ adb shell
# mkdir /data/busybox
# exit
$ adb push busybox /data/busybox
$ adb shell
# cd data/busybox
# ./busybox --install
# export PATH=/data/busybox:$PATH