Posted by Jayce Ooi as Software
Google makes restoring Google Nexus devices to original factory firmware easy. Google provides factory images for all Nexus devices because most developers will install custom ROM based on Android Open-Source Project. And this factory image will make Nexus device return to its factory state. Same apply to Google Nexus 7. We can download Nexus 7 factory image and flash it.
Google Nexus 7 factory image