I rooted my Android ICS with some script. It was rooted then I installed and removed some system application. Then I formatted the device and re-installed the ICS.
Now when I try to root it again it gives error could not copy are you a root? I searched for that and finally found that though I re-flashed it any times. /system is read-only. So then after I tried
adb shell mount
then command of mount and it gives error permission denied. Please help to reset the permission of /system so I can manually add the su file in it.
The technique i used to Root is at this link. Then i format using cwm and install new rom. Now i am not able to root it.