Hi, stock 2012 Nexus 7 keeps trying and failing to update to 4.3 JWR66V despite already having this. All working OK but obviously won't then update to 4.4. Rather not root etc and a bit pissed that a stock device won't update without this hassle. No problems before and also never had an issue with my Nexus 5 & daughters 4. Help much appreciated. Will post error details if it helps but they are several lines of (to me!) unhelpful code.