get the root access back on android development phone ADP1

After upgrading ADP1 to version 1.6, root access was lost. However, it can be regained using the ADB tool.

adb shell
mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system
cd /system/bin
cat sh > su
chmod 4755 su

Reference: http://phandroid.com/2009/04/29/adp-15-initial-thoughts/