Possible complete downgrading solutions
I was running some ideas past me last night, which caused me to look at some of Apple other devices.
I'm not too sure if it was possible, but would it be possible to completely wipe the iPhone's flash memory? I remember trying this out on iPod's, and iTunes picked it up and did a complete reformat of the iPod, even changing the filesystem from NTFS to FAT32.
Maybe if you completely wiped the iPhones memory, then iTunes will be forced to reflash it with complete new firmware, if iTunes is as good as I hope it is...
Dunno just an idea, figment of imagination. Wondering if was possible so I'll pass it by you guys.