How do I flash back to stock?

[Snareman]

I'd downloaded and flashed the 4.1.1 update before it went OTA and because of that I don't think I'll get the 4.1.2. I tried installing the 4.1.2 file and the install aborted. So what do I need to flash back to to get to stock so I can get on the official update bandwagon?

Thanks