I'm having problems hacktivating iOS 6.1 in my iPhone 4. In 5.1.1 I could use Redsn0w but it doesn't support 6.1. I tried redsn0w with 6.0 IPSW selected and I was able to activate (the 6.1) but most applications didn't work (Calendar, Maps, Mail...). Is there any solution? Maybe waiting for a new Redsn0w release?