Downgrade from Paranoid Android 4.0 alpha to 3.99RC2

Hi, i just flashed this Paranoid android 4.0, only later to find out that this is Pure AOSP and there are no PA settings available at the moment. Now i want to downgrade to 3.99RC2. However when i tried to flash, it says some error and i couldn't do it!.. Please help and advice!.. I tried wipe/factory reset, wipe cache, wipe delvik cache..

Is there any other procedure to downgrade?..

P.S> Previously i was using Philz CWM and just for Flashing PA 4.0 i flashed Raw kernel as advised in the PA 4.0 discussion forum. Is it bcoz of that?.. Do i have to go back to Philz Kernel?..

Thanks in advance :)