Hello, I purchased an Nexus 7 from Office Depot yesterday, its stock 4.1.2. I got a notification saying 4.2.1 is available. I downloaded, than clicked install. Device reboots and starts the install, than fails halfway and just freezes. When it reboots it just says system is up to date but it still shows 4.1.2. Only way I can get it to redownload again is by deleting the data under Google Services App. but even still it fails time after time. Any ideas?