If you are going to exchange it anyway and it is essentionaly bricked from your standpoint, you might as well try installing the factory images. It can't get any worse, and who knows when you might need the skill set in the future.
I understand if it isn't worth the trouble though. The first time takes a little longer, but after that it takes around 5 minutes per unit.
Disclaimer: No touchscreens
were harmed nor injured during the creation of this post. GPS
units were all treated ethically and humanely.
Signed: People against misbehaving Nexus 7 2013s