Ouch.. my general rule in iphone mods is wait 3 months before using any new released hack. Since you know how to use quickpwn, i suggest you read this page...

http://www.quickpwn.com/2009/01/downgrade-...-221-to-22.html

Wait a minute, wont the bootloader overwrite the whatever current baseband? So it isnt really that hard to downgrade the phone right? If that fail, you can always try the riskier move by crashing your phone and rebuilding it from ground up using ziphone. It helps of course if you have a spare iphone to try it on first

Ah I see, i guess you cant flash the baseband like the old ignorant days. If i'm not mistaken, the old ziphone software overwrite the baseband right? so i think you can probably do the something similar to this newer phones. Of course I realise the risk of it being permanently bricked is like 50-50.

Oh well, thats what you get for being out of the game for too long. The last time i did a jailbreak was last year. Time to catch up...