get the root access back on android development phone ADP1

It seems that after upgrading ADP1 with 1.6 , the root access gone.

It can be recovered with adb tool:

Connect your mobile with the computer,

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

Worked Great!!!