Originally Posted by juliangs
Couple of things....
1. i have not been able to root the phone, not sure if that alters the approach?
2. i have got the rom.zip and have copied it to the SD card and renamed it PB99IMG
3. however when i try to open the rom in explorer, once copied, i get an error from windows telling me the file is invalid!
I'm guessing you know how to use fastboot, if not just say and I'll give you a step by step. With the ROM you extracted from the RUU you should be able to open it with WinZIP and you will find the phones original boot.img there.
Run fastboot and you can "fastboot flash boot C:\boot.img" If you can not find how to extract the boot.img I can email it over to you.