So I wanted to upgrade from 4.0.1 to 4.2.1 and was doing the following: 1. Created custom IPSW without baseband update (4.2.1) 2. Restored custom IPSW through iTunes. 3. Jailbreaked using greenpois0n And now run into a problem since my iphone says I must put and AT&T sim card (which I do not have! I live in CR). What can I do now? I thought that problem would of been covered by the jailbreak? I have now a completely unusable phone.