Evad3rs Untethered Jailbreak 6.1: Evad3rs Dev Team suggested jailbreaker to update their iPhone, iPad or iPod touch via iTunes restore rather that OTA update to get iOS 6.1 Untethered Jailbreak.
If you people plan to upgrade to iOS 6.1 please don’t do an OTA upgrade. Please make a full restore using iTunes.
Another devs from Evad3rs Dev Team MuscleNerd has given some explanation on why this is necessary, “a few reasons: OTA is more time-consuming for us to test, and it gives you different SHSH blobs than normal restore.”
So, it is highly recommended for thos users who want to jailbreak their iPhone, iPad or iPod touch on iOS 6.1 they must update their iDevice via iTunes restore.