Hi I tried using the steps below to flash, no luck going to ICS.
Anything i might be doing wrong, i change each of the 4 files to update.zip and flashed it one by one, rebooting after each flash.
Flashing through official recovery:
1. Download this archive. Unpack it. The archive contains 4 files numbered in the order of updating.
2. Rename update1.zip in update.zip and place it on the SD card. Flashing through official recovery.
3. To execute the 2nd point for update2.zip, update3.zip and update4.zip.