Problems with unrooting Nexus 7

Heyyo, I've been looking all over the internet but couldnt find any help so here's the problem. I dropped my nexus 7 and the screen cracked so it lost its touch functionality. I wanted to sent it back to google for a new one, but it's rooted and I think that voids the warranty. I can't figure out how to unroot it without touching the screen. The volume & power buttons do work though. I'm not exactly sure what OS it has, but I preordered it when they first came out so it's gotta be the original firmware.The bootloader is 3.34. Can someone walk me through how to unroot this so I can send it back?? THANKS

if you don't mind wiping the device you can always factory reset it using the stock recovery.

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Originally Posted by wunderbar [Only registered and activated users can see links. Click Here To Register...]

if you don't mind wiping the device you can always factory reset it using the stock recovery.

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factory reset wont remove the root!!

try adb to remove su file from xbin folder and supersuer.apk file from system/apps folder.

that will remove root.

Can't he use the nexus root toolkit?

Sent from yo moms house son!😎😎Using my SPH - L710 running AOKP Rom 4.1.2, now initiating Swagger

I'm a comeplete noob and don't know what adb is, but I did try using the toolkit and i tried this [Only registered and activated users can see links. Click Here To Register...] Problem is, the bootloader in the firmware I downloaded doesn't match mine I think? Iol I really dont know what im doing