[G4 Q&A, Help & Troubleshooting] deltadiesel:
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That is based of Korean lg nougat ROM

Download depacito or freedom ROM and do this. DO NOT upgrade ...use current ROM u are on

Copy these files provided below on to your sdcard

1. twrp

2.SuperSU,

3. opengapps,

4. ROM/ROMs

to avoid mistakes name TWRPXXXXXXXXX TO recovery.img and SUPERSUXXXXXXX TO Supersu.zip

1. Activate developer settings by entering the about section and tapping build number 7 times.

2. Enter your developer settings and MAKE sure you have 'Allow OEM unlock' and 'USB Debugging' enabled.

4. download Minimal ADB and Fastboot and install it....Y ....Y .Y ...... ( yes yes yes )http://www.devfiles.co/download/P4Yv....4.1_setup.exe

5. Once the Command window is linked to the folder adb connect your device via USB and allow the connection.

This is hardest step for most.

Adb will be installed c:/minimal adb and fastboot

Open command prompt

Type " CD.." Without quotes till you are in C:/ directory

Once you are in C:/ directory you type "dir" without quotes

There will be a folder named Minimal adb and fastboot

Now type

"CD Minimal adb and fastboot" without quotes

You are now in the adb folder

6. On the command window type 'adb reboot bootloader' and the device should reboot with the fastboot options on the upper left of the phone screen

7. Once again on the command window type 'fastboot oem unlock' and the command window should say OKAY and complete the action.

8. To Confirm that the device is unlocked type 'fastboot getvar unlock' and the window should respond with 'Unlock: YES'

9. Now download the latest available TWRP and drop it into c:/minimal adb and fastboot

10. On your Command Window type 'fastboot flash recovery "NAME OF TWRP FILE" if you get the error ' cannot load recovery' you need to add .img to the end of the filename (name of twrp in this case will be recovery.img to make things easy)

11. Once the process completes you will see 'target reported max download size of 536870912 bytes

sending 'recovery' (32968 KB)...

OKAY [ 1.088s]

writing 'recovery'...

FAILED (remote: unknown command)

finished. total time:'

THE FAILED UNKNOWN COMMAND NOTICE CAN BE IGNORED

12. Once the process completes the device may not let you enter recovery from the traditional method using the buttons on the back of the phone so the easiest method is to, on your command window, type

'fastboot boot recovery.img' and the device should respond within just a few seconds and reboot into TWRP.

13. Once the device reboots, enter twrp

THIS IS WHERE IT GEETS CONFUSING

* this will boot twrp on the phone itself, YOU WILLL NOW FLASH TWRP onto your device from sdcard

In TWRP hit Install > Images... (bottom right corner) > select recovery.img on ext sdcard > select "recovery" > swipe.

This time you are flashing it onto your device. You only entered it before

Power off

To enter twrp you will

1. Press power and volume down

2. While holding volume down release power and press power again

3. Select yess >power button

4. Select yes > power button

NOW that you have custom recovery installed and you are in TWRP(custom recovery)

Say goodbye to your LG recovery....

Select BACKUP

Make a backup of everything ....save it to sdcard.

NEXT ...

Select WIPE....WIPE EVERYTHING......GOODBYE LG ROM. We backed it up step before

Flash the ROM you put on your sdcard (press install .....select sdcard....install ROM you downloaded)

Press back

Flash open gapps (press install .....select sdcard....install gapps you downloaded)

Press back

Flash Supersu (press install .....select sdcard....install ROM you downloaded

14. Once the process completes successfully, wipe cache to be safe and reboot your device.

YOUR DEVICE WILL NOW LOOP FROM FLASHING SUPERSU

ROM INSTALATION WILL TAKE 5-10 min

15. Resetup your device and restore your data if necessary and install a root checker from Google Play to confirm root!

Enjoy!