If you like update Your Nexus 7 to latest Android 4.2 version, there is two ways.
First, OTA update;
It is easiest way to do it, if you don't have rooted and change your kernel or modify system files. OTA update works fine even if you have just rooted your device but doesn't change your kernel or modify system or prop files. Update doesn't remove root. You can try this way first, even you don't have sure. If update found problem it doesn't update your system.
Second, Manual update;
This option becomes only change if you have rooted and modified or/and change your kernel. That was my way. There is several ways to do it. I am noobie with Android system so I don't like start doing replace files or modify them. I thinked there must be some much easier way to do it, for people thou don't know programming or system manipulating.
After little internet digging, I found really useful utility kit that made everything to me very easy. "EZ Update Android 4.2/CWM/Root/Save Data/1 Click" safe your day if your OTA update fail. This utility is really easy to use, but YOU NEED READ Read Me file before you start do anything. You and only you are responsible what your device happen, no one else. You use that program your own responsibility!
Program will flash (or re-flash) the Android 4.2 update (Including system, kernel and boot-loader). It will flash latest 4.2 compatible Clockwork-mod Touch Recovery also. And then it will get you full set up to re-root your Nexus 7 within the latest CWM.
It will NOT erase your data and you DON'T need to be on a stock ROM to run this utility, but it is recommended when you get into CWM recovery for obvious reasons.
If you have any issues and get caught at Google splash screen. You can use Power, Vol - to hard shut down the tablet, then Power, Vol +, Vol - to get into the boot-loader. From here you can install the factory images from Google. Once you're back up and running, you can run this tool to gain root and CWM back.
Download Program PLEASE READ the Read Me!!
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