Root adb unrooting help

[droidftw]

i am trying to unroot my droid using adb.
i nandroided back to a stock frg22d with root.
here what i type that doesnt work.
cd
cd c:\androidsdk\tools\
adb shell
$ su
# rm /system/app/superuser.apk
its says its a read only file so then i treid
adb shell
$ su
# rm -r /system/app/superuser.apk
but when i try that it says superuser.apk doesnt exxist
i typed the same commands 1 week agao to unroot and it worked.
i dont know what happened now.

 

[droidftw]

fixed by typing in mount -o remount,rw -t yaffs2 /dev/block/mtdblock4 /system the rm -r /system/app/Superuser.apk
it the worked for busybox and su also