Dev team already warned don’t upgrade to 3.1 and wait for next version of Pwnage Tool to preserve your baseband. Upgrading to 3.1 with Ultrasn0w installed will cause people to lose Ultrasn0w and will

Some time while jailbreaking and unlocking process iPhone refuses to boot in normal mode and every time you restart your iPhone it enters in Recovery mode. This situation is named as recovery mode loop.