In most of the cases, a firmware downgrade is performed to gain root. A firmware update patches the security exploit so downgrading comes to resue.
However, in our case rooting will never be an issue thanks to the unlockable bootloader of LG K20 plus
For K20 Plus we need to downgrade only if stuck on Google’s Factory Reset Protection (FRP) screen while doing a hard reset. To bypass the Google account verification process (FRP) on LG K20 Plus we’ve to downgrade the firmware to mp26010j. Let’s see how to do this –
How to Downgrade LG K20 Plus Android Firmware –
The first step is to boot the phone in download mode.
To enter download mode –
Connect one end of the USB data cable to your K20 Plus.
Now press the Volume UP button.
Keep the Volume UP key pressed, and connect the other end of the USB cable to your computer.
The phone will boot into download mode.
The screen would flash “Download Mode” for a moment then it will change to “Firmware Update” as shown above.
Wait for LG AndroidNet USB Serial Port driver to install before moving further.
If you haven’t installed LG USB driver on your PC yet, you can download it from the below link –
Once downloaded, install the USB Driver setup file as shown above.
You can see the download mode serial port driver is installed successfully.
Now we are ready for the downgrade.
The files that we need for the downgrade process are –
- LGUP Store Version 1.14 – The Flashing software
- UPPERCUT – It serves the purpose of LG K20 Plus DLL file.
- LG K20 Plus mp26010j.kdz – The stock firmware / ROM file
Download the zip file from below link on your computer & extract it. It contains all the necessary file for flashing.
First of all, we’ve to install the LGUP setup file as shown above.
Finish the LGUP installation but don’t run it yet. It won’t detect the connected LG K20 Plus without the help of uppercut.
Now we’ve to run uppercut and it will load LGUP on its own.
Earlier, it was a pain to search for the proper DLL file as its different for every LG model.
Without the proper DLL file, LGUP cannot detect the connected phone in download mode.
Thanks to Autoprime@xda who made this one software which works for any LG phone and no more searching for a DLL file.
Open the UPPERCUT folder.
Double click on the Uppercut.exe file to run.
Wat till it loads LGUP.
LGUP is loading
You can the current firmware version is showing up in LGUP
The connected phone is LGMP260 running android version MP26010x.
This is the latest LG K20 Plus software with Android Security Patch Level February 1, 2018.
We’re going to downgrade it to MP26010J.
Tap on the “3 dots” icon and browse for the downloaded kdz file for flashing.
Select MP26010j_00_0316.kdz file and OPEN it in LGUP for flashing.
The kdz file is added to LGUP.
You can notice the Flashing Process is set to “REFURBISH”
We’ve to change the flashing process from “REFURBISH” to “UPGRADE”.
Even though we’re downgrading we’ve to select UPGRADE.
Now click on “Start” to initiate the process.
At 4 % you’ll notice it says “Anti Rollback Check PASS”. This explains that the current firmware can be downgraded.
Wait for the downgrade process to complete.
At around 80% the process gets completed and the phone Reboots.
Wait till the process gets completed to 100%.
We’ve successfully downgraded LG K20 Plus from mp26010x to mp26010j.
Now you can easily Bypass Google Account (FRP) on your K20 Plus.
If facing any issues please leave a comment below.