Excellent news for unlocked Galaxy Nexus and Nexus 7 owners like myself who enjoy the pleasures of fiddling with those respective devices. The Google Development team has officially released the official Android 4.1.2 build JZO54K factory images for the unlocked Galaxy Nexus (“takju”) and the Nexus 7, respectively. This means that should you happen to take your general tomfoolery too far and create an “oopsies”, you’ll be able to restore the device back to normal as if nothing ever happened. And who wouldn’t want the ability to bring their device back to its original state?
Full details and links to the factory images are available once you hit the source link below.
source: Google Developers