How can I put my Nexus 7 back to factory default ? I have a Nexus 7, that I rooted and upgraded once, but it now seems that something changed it. As it is registered in Google Play, there are way too many applications that I cannot install on it. I keep seeing statuses like "This item is not compatible with your device." while it was listed as being compatible with the tablet, as it was even analyzed in a magazine for the nexus 7. 

I am ready to put it back to factory defaults, as it came out of the box. Where can I find the files to put it back ? I am familiar with CWM, and ADB.

Thanks :-)
Have a look at one of these toolkits, they each have an option for installing a stock rom back on to your device. Have included links to osx, windows and linux:


http://forum.xda-developers.com/showthread.php?t=1837401 (mac)
http://forum.xda-developers.com/showthread.php?t=1809195 (pc)
http://forum.xda-developers.com/showthread.php?t=1848036 (linux)