I upgraded my baseband 6.15 on 4.2.1 iphone 3gs so that I can unlock it to any network. But then Cydia was not working so I thought I reinstall it. I connect to iTunes and clicked on Restore, since then it is in RM, when I restore it stops in middle and an error occurs. Can any one tell me what to do? I tried again and again but it does not get out of recovery mode. I'll be very thankful if you can help me to solve this problem.