So I decided to finally upgrade the iP4 form 4.01 to 4.1. I wanted to preserve my baseband and keep it untethered so I'm using PT 4.1.2. It seems to be successful. iOS updated to 4.1, baseband still at 1.59.00. Getting push, phone calls working. But I can't open Cydia. It closes as soon as I try to open it. Anyone know why? Is it because I used an older PT tool and Cydia has since been updated? It was working fine on 4.01.