Galaxy S3 update TWRP recovery and make a Nandroid backup.

How to update TWRP recovery and make a Nandroid backup on the Verizon Samsung Galaxy S3 with a unlocked bootloader

Link to GooManager app from google play store

How to install Android Device drivers
Why Root Android devices video
Android device hacking explained
Universal UnRoot App for all Devices

Warning… do this at your own risk.
I am happy to help with any problems my subscribers are having on their android devices. I am going to need lots of info from you to help. 1. What device you are on. 2. What android version you are running. 3. What rom or stock rom you are on. 4. What you have done to the device. 5. What recovery system you are using. With this info I will be able to help much faster. 



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