@bejo
I also have the same problem with my 1ST GEN iPhone. I will try to downgrade to 2.2.1 today and try to Quickpwn and then upgrade to beta 5 again and see what happens. If this doesn't work I will try to jailbreak beta 5 with the new quickpwn5full and then bootneuter from Cydia...

. I will know by tomorrow morning...