iH8Sn0w Discovers APTicket Vulnerability for Easy 5.1 Downgrade

Popular iOS jailbreaker iH8Sn0w tweeted yesterday that he has found a “loophole” in Apple’s APTicket system for signing firmwares. For those that don’t know, Apple began requiring approval from their servers before allowing a device to restore to a certain firmware, so they could keep people from downgrading to older, less secure versions. This originally