problems updating to 4.2.2

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http://forums.androidcentral.com – My nexus is unlocked and rooted. I'm using nexus root toolkit v1.6.2 and I have twrp on my nexus. I have tried updating through system settings by going to apps/google play services and cleaning the cache data, then going to "about tablet" and checking system update. It downloads the update fine, but after restarting it loads into boot-recovery, but it gets stuck at the twrp options page and doesn't load the update like it normally would if it was stock/unrooted. I have also tried flashing the 4.2.2 .img with the nexus root toolkit and it always get seems to get stuck at the googl (HowTos)