Help! trying to go to stock 4.2.1 but it says baseband does not match

Long story short, I received the Nexus 7 as a gift from someone at Google. However, when I tried to update the Google app, it said the app wasn't signed. So i tried a bunch of things. Now I am trying to put on stock 4.2.1
This is the 3g version.

Tried to do everything and when I tried to fastboot the stock image, I get a message that

Device version-baseband is '1231_0.10.0_1020'.
Update requires '1231_0.10.0_1021'.


How do I go about getting this thing to work?

Not sure if you got this fixed but I found on another site that you have to flash the radio first.

"flash radio radio-tilapia-1231_0.10.0_1021.img" or whatever the radio file you have is.

Do this after you flash the bootloader but before you do the update part.

Hope this helps.

Nixx

go to xda forum and get Mark's Nexus 7 Toolkit , install it on your pc, put the device in fastboot and hook it up. pretty much everything you can possibly need will be there on his menu. and send him a donation - it is fabulous work