I get a kernel panic when I'm trying to boot/restore an iPhone 3GS with iOS 5.0.1, old BR and baseband 6.15.00. The error says:
So far, I have tried different combinations of restoring/booting/etc with iOS 4.1, 5.0.1, 5.1.1 and 6.1.3. I have also tried downgrading the baseband with redsn0w. I know that "Synchronous parity error" is an error thrown by the ARM processor. I don't understand if is related to the firmware or if the hardware is broken and thus not fixable.