It was an inadvertent upgrade - my fat thumb's error - but it went fairly well. I have a bit of reorg to do, but that's ok. The only thing I don't see how to do is to get back onto LTE. Right now I'm stuck on 4G even though my cube neighbor is getting LTE - so we don't have a network problem. I've tried restarting of course. Pulling out the SIM... Any ideas.