Hello I know, do a search! But very short on time. Maybe someone has an estimate of the chances of me getting into trouble. I've got a T-Mobile (UK) branded HTC Tytn II, unlocked (SIM-free) and out of warranty. The upgrade from Win Mob 6 to 6.1 sounds like it's worth 30 mins to do and 30 mins reinstalling a few apps, and I'd get the bonus of losing all the T-Mobile branding. What are the chances of me running into serious problems (ie anything that would take more than an extra hour to solve)? Thanks. Colin.