LG K51 Firmware Downgrade Android 11 to Android 10 for FRP bypass

The LG K51 from MetroPCS & T-Mobile is now updated to Android 11. After this new update, the old FRP bypass method no longer works.

There is a new Google bypass method for LG K51 Android 11. However, even after bypassing the Google verification screen, it reset the device automatically at the last stage, after reaching the home screen.

After completing the device setup wizard, an error appears on the screen for a moment – “Factory Reset is proceeded by server policy” & the phone resets on its own. After the reset, it again brings you to the “Welcome” page of the setup wizard.

So, as of now the only way to bypass the LG K51 Android 11 Google lock is firmware downgrade. We need to downgrade the K51 software from Android 11 to Android 10 & use the old method to bypass the Google account.

Let’s see how to do this –


First of all, download the necessary files –

1. LG K51 Mobile Driver v4.5


2. LGUP Lab Frame Ver 1.16


3. LG K51 DLL File v2.3


4. LG K51 Android 10 Stock Firmware ROM

LG K51 Android 10 MetroPCS ROM


LG K51 Android 10 T-Mobile ROM



Download the above files and save them on your computer.

LG K51 Firmware Download & Software Update – Downgrade Android 11 to Android 10 Stock ROM MetroPCS T-Mobile LMK500


First of all, we need to install the LG Mobile Driver on the PC.


If you’ve not yet installed the LG Driver on your PC, install it now.

Follow the on-screen prompts to complete the driver installation.



We need to put our LG K51 into Download Mode to flash the stock firmware.

Power off your LG K51 as shown above.



To put your K51 into download mode –

  • Power off the phone.
  • Get a USB C data cable.
  • Insert one end of the cable into your PC’s USB port.
  • Press & hold the K51 volume up button.
  • Keep the key pressed & connect the other end of the cable to the phone.
  • Your phone must be now on the “Firmware Update” screen. This is known as Download Mode.


The download mode is used to flash the stock firmware.

Open the Device Manager on your PC and check the driver installation status.

LGE Mobile USB Modem & Serial Port drivers are required.

In the next step, we are going to install the LGUP software.

Double-click the file “LGUP_Lab_Frame_Ver_1_16” to install this program.

Follow the on-screen prompts to complete the installation.


Now, we need to replace a DLL file in the LGUP folder.

Copy the downloaded DLL file – “LGUP_Common.dll” as shown above.


Now, open the folder where you’ve installed the LGUP software. I’ve installed it in the C drive on my PC.

In Local Disc (C:) we need to open the “Program Files (x86)” folder.


Now, select “LG Electronics”.


Then click on the “LGUP” folder.


Now, open the “model” folder.


Now, double-click the “Common” folder.

In the Common folder, paste the copied LGUP_Common.dll file.

When prompted, choose “Replace the file in the destination”.

Click “Continue” to provide administrator access to paste this file.

In the next step, we are going to launch the LGUP flash tool as shown above.


In LGUP the connected phone is visible as LM-K500MM which is the model number of LG K51 MetroPCS.

The current software version is K500M20f. This is the Android 11 firmware.


Tap below “File Path” and hit the “3 dots icon” to browse for the Android 10 firmware file.


Choose the correct firmware file for downgrading.

Mine is LG K51 MetroPCS. The firmware file will be different for the K51 T-Mobile variant.


We are going to downgrade the K51 firmware from K500MM20f to K500MM10r

Tap “Start” to begin the process.


Do not disturb the phone on PC until the process is complete.


The phone reboots at around 80%.




The process is now complete. We have successfully downgraded the LG K51 firmware from Android 11 to Android 10.

After downgrading, you can follow the below method to bypass the Google account on LG K51 –

LG K51 FRP Bypass 2021 Android 10 without PC


2 thoughts on “LG K51 Firmware Downgrade Android 11 to Android 10 for FRP bypass

  1. When I try to install the first file it keeps telling me that its violating the terms of service I don’t know why its happening but I would like some assistant with my problem with your outmost help.

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