How to install stock Android 5.0 Lollipop on LG G3 D855 and root it

LG G3 D855 is among a lucky few Android devices to taste the stock Android 5.0 Lollipop update, thanks to the release of stock Lollipop ROM by XDA Developers senior member, Sooti.

Those who have already rooted their LG G3 on custom Lollipop ROM can now revert to stock version, using the following step-by-step guide.

Note: This guide provides you the complete step-by-step instructions to install stock Android 5.0 Lollipop update on LG G3 unofficially and then root it via SuperSU.

IBTimes UK reminds readers that it will not be held liable for any damage to device during or after the Android 5.0 stock firmware installation. Users are advised to proceed at their own risk.

Pre-requisites

Root LG G3 to install Bumped TWRP recovery using any of the following rooting tools: IOroot, Towelroot, Purpledrake, Stump Root and RootTool (click to see guide).
Install Bumped TWRP Recovery on G3 D855: Click to view guide

Download and install LG USB drivers from here

Back up your device's storage, SMS, contacts, and calendars etc.

Take Nandroid Backup of your current ROM via TWRP.

Enable USB Debugging by navigating to Settings > Developer Options

Setup Android SDK (ADB and Fastboot): Click to view guide

Downloads Required

Android 5.0 Lollipop Stock ROM for LG G3 D855

SuperSU v2.37

Steps to install Android 5.0 Lollipop update on LG G3

Connect your G3 to the computer via USB cable in Media Device (MTP) mode.
Copy the downloaded LG_G3_D855_Stock_20C_Bumped_Fixed.zip file to a suitable location on your device's storage.
Reboot the device into recovery using hardware buttons or open a new Command prompt (CMD) and enter the following command to reboot into TWRP recovery mode: adb reboot recovery
Select Wipe > Advanced wipe and then enable or tick System, Data, Cache and Dalvik Cache check-boxes. Finally, swipe the button at the bottom to begin flashing the ROM.
Once the ROM is flashed, return to the TWRP main screen.
Tap on Install, browse and select LG_G3_D855_Stock_20C_Bumped_Fixed.zip
Once again, swipe the button to confirm and start the flashing the Bump fix.
It may take some time to complete and once it is done, choose Reboot and tap on System.

It must be noted that flashing this ROM does not affect bump and it will remain intact. However, the first boot may take some time to complete. So, wait until the system boots to the home screen.

Root LG G3 on Lollipop

LG G3 D855 can be rooted easily on Android 5.0 using Chainfire's SuperSU v2.37, which is the latest and most stable working root for Android Lollipop.

Connect the device to computer again in Media device (MTP) mode.
Copy the UPDATE-SuperSU-v2.37.zip to a desired location on the device storage.
Reboot into recovery using hardware buttons or open a new Command prompt (CMD) window and enter the following command to reboot into TWRP recovery mode: adb reboot recovery
Tap on Install, browse and choose the UPDATE-SuperSU-v2.37.zip
Finally, Swipe the button at the bottom of the screen to initiate the flashing process.
Once the process completes, navigate to Reboot and tap on System.
If prompted to fix root, tap on Do NotInstall.
Confirm root access on the device by installing and running the root checker app.