UNROOT METHOD FOR AT&T LG G3
So you messed around with your G3 too much and broke something... or do you need to return it or send it in for service. In either case, you may need to un-root and restore the phone to factory settings.
Follow the instructions below to get your phone back to stock.
How to un-root the LG G3 on AT&T
To Confirm that you have no Rooted flag in the service menu, follow the instructions below
WARNINGS & DISCLAIMERS
Proceed with caution and at your own risk - I am not responsible if your phone self destructs, gets bricked, or melts.
Please keep in mind that both these methods will yield ROOT only - as of know there is no way to unlock bootloader on AT&T
Rooting and any other modifications to your phone will void your warranty - do not root if you do not know what you are doing.
Rooted devices will not be able to receive OTA updates. You may have to unroot and restore stock in order to accept updates.
So you messed around with your G3 too much and broke something... or do you need to return it or send it in for service. In either case, you may need to un-root and restore the phone to factory settings.
Follow the instructions below to get your phone back to stock.
How to un-root the LG G3 on AT&T
1. Download all four files
Driver
LG Flash Tool
.DLL
.TOT
Mirror of above files - Thanks to clsA
***If anyone is interested in mirroring the above files... please do so and post the links and I will update the OP***
2. Install LG United mobile driver
3. Install LG FlashTool using instructions in zip folder
4. Unzip LG850AT-V10d.zip and LGD850_20140613_LGFLASHv160_DLL.zip in to a new folder
5. Turn of your phone
6. Using a USB 2.0 Port, plug one end in to PC
7. Hold the Volume Up key and plug USB cable in to phone - this will put your phone in to download mode.
8. Open Device manager and scroll down to Ports
9. Click on Ports and right click LGE Mobile USB Serial Port
10. Select properties - go to Port Settings Tab and click on Advanced
11. Change COM Port to COM41 - Click OK and Close device manager
12. Go to LG Flash tool and run as administrator
13. Select Manual Mode and browse to the folder you extracted the files to and select the .dll and .tot you downloaded
and unzipped in item 4 and place in corresponding box. dll in dll box and .tot in S/W box
14. Click OK
15. Click Yellow arrow to begin
16. When the Port 1 (COM41) box is ready, unplug USB cable from phone, wait 5 seconds and plug cable back in to phone.
17. The process will take up to 45 Min (Mine took 2594 sec)
18. When you see a large 3 on the screen - unplug phone, pull battery and reboot
At this point your phone is un-rooted and restored to factory settings.
19. Once you reboot - go to settings, backup and restore, and hit reset to perform a factory reset. (Optional)
20. Download root checker and run to confirm you no longer have root (Optional)
To Confirm that you have no Rooted flag in the service menu, follow the instructions below
To check:
1. Go to dialer
2. enter 3845#*850#
3. Scroll to and click on LG RCT
4. click Display Results
Here you will see that it shows the device is rooted
WARNINGS & DISCLAIMERS
Proceed with caution and at your own risk - I am not responsible if your phone self destructs, gets bricked, or melts.
Please keep in mind that both these methods will yield ROOT only - as of know there is no way to unlock bootloader on AT&T
Rooting and any other modifications to your phone will void your warranty - do not root if you do not know what you are doing.
Rooted devices will not be able to receive OTA updates. You may have to unroot and restore stock in order to accept updates.
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