I know this error has been discussed, but I can't seem to get rid of it... I built my custom ipsw w/ Pwnage 2.1, and when I Option + Restore in iTunes (after iTunes has recognized my 2G iPhone in recovery mode), and select my Custom ipsw, I keep getting this error. I've done what has been instructed--deleted all files in Library/iTunes/Device Support & re-built my Custom ipsw. This is driving me nuts. I'm on a Mac, running the latest version of Leopard (10.5.5) & iTunes 8... Can any kind soul give me some ideas on what to try next?