I followed the steps today to convert my JB 3.1.2 to JB 4.0, but unfortunately missed the 'shift-click' step to select the custom ipsw file, so ended up with a stock 4.0 installed. I had mistakenly thought pwnage tools had changed where iTunes looked for the upgrade file, and hence thought all was OK at the time.

Anyways, I know you have to *start* with a JB 3.1.2 install to get a JB 4.0, but I was wondering if I can skip the hassle of this now, given I have a custom ipsw file created when I did have a JB 3.12, and so now can just put the phone into restore mode, and select the custom 4.0 ipsw properly?

Thanks for any help!