UPDATE: If you need to unroot your Evo 4G completely back to stock, see Unroot Evo 4G Here!!!
Nandroid is a fantastic tool for your HTC Evo 4G to backup/restore the complete system state including apps, contacts, and the rest.
For those of you who have used Nandroid (if you’ve followed all the steps in the root HTC Evo 4G guide) to backup your stock ROM, yes you can easily restore back to it.
This won’t really “unroot” your HTC Evo 4G because there’s actually no way to “unroot” your phone after rooting it BUT it will get it back to the exact same factory state. No, I don’t think Sprint can tell if you’ve rooted your phone if you somehow return it. I believe it doesn’t void the warranty when you root it and there’s no way Sprint will be able to tell unless they’ve got Android experts working for them, I highly doubt that.
So, first you will want to shut your Evo 4G down.
Then start your phone into Hboot (bootloader) mode by pressing power button WHILE holding down your volume down button.
Once in bootloader, wait until your SD card is cycled then hit the volume button down to choose “recovery” then hit the power button to enter recovery menu.
If you see above screen, you are in recovery. Connect your HTC Evo 4G via USB cable to your computer.
Run the recovery-windows.bat (for Windows systems).
Your phone should now be in the above screen.
Choose “backup/restore” then “Nand restore”. Then find the backup file you made.
Hit power and start restoring.
When it’s done, hit the power button to reset your HTC Evo 4G.
Now, you’ve unrooted your HTC Evo 4G. (sorta.)
You can use the same method to also restore any ROMs you’ve saved using Nandroid.
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