I have an already unlocked 1.0.2 iphone working with non AT&T sim. I updated by mistake to 1.1.1 and now visiting jailbreakme.com not cause iPhone to ring itself. I decided to downgrade to 1.0.2 and virginized but then I realised IMEI is not 0049* which means seczone is not corrupted and I should be able to use jailbreakme.com for unlocking phone in 1.1.1 version but I can't. Could an expert explain why?