so i have a jailbroken and unlocked phone, 3 gs ios 5.1.1. I had jailbroken it earlier with redsnow (i think). can i upgrade to 6.1.1 safely or will the phone be bricked? also, i have noticed that i do not receive group texts from other iphone users sometimes. is this because i have not upgraded? and is there a workaround for this? thanks.