I unlocked and rooted my nexus 7 with zero neck's guide but did not flash a custom recovery on it, so it still has the stock recovery. Iv gone into settings > apps > all > google services framework, cleared the data and force stopped it. That will let me download 4.2 again but after I reboot and it goes to install, the little android guy on his back with the red triangle. I have also tried using the side-load method, but google's adb driver wont install on windows 8. I want to update to 4.2 but I don't want to have to wipe it to install the update. Any help would be great.