For those who had installed the leaked Android 4.1.2 Jelly Bean software build V20a on their LG Optimus X HD P880 you can now easily root this ZeRospot made root method via ADB without downgrading back to previous firmware version just to let the old method works again. This time the rooting method for LG Optimus X HD P880 Android 4.1.2 Jelly Bean has been a lot more easier, since LG has sent this 4.1.2 update with ready to unlock bootloader.
Disclaimer: Rooting will void the warranty of your device. The developer of this root kernel, custom recovery and including us shall not be held responsible if anything happens to your device. Use of this guide is solely at your own risk.
How to Root LG Optimus 4X HD P880 V20A 4.1.2 Jelly Bean
Get the root file and instructions at XDA-developer.
1. Download and install the necessary First you need USB driver for your PC or Laptop to connect your phone. So, grab the LG USB driver and install it on PC.
2.Turn the phone off, press the “volume down” and “power” key to boot, do not release the volume down key until the screen appears with a red triangle robot.
3 Insert the USB connected to the computer, use the “volume” down select “Apply update from ADB, press the power button to determine two lines of yellow text prompts.
4 Double-click ROOT.BAT.
5. Wait until the installation is complete, the phone to return to the menu cursor restart items, press the power button to restart the phone.
6. A Superuser icon appears on the phone, running “information page, click here to check for updates, connect to the network, mandatory update
How to install CWM ClockWorkMod 126.96.36.199 on LG Optimus 4X HD P880 runs with 4.1.2 JB V20A
Now, that you already have rooted v20A, you may proceed to install the latest version of ClockWorkMod Recovery – CWM 188.8.131.52.
Tested and confirmed that after “Unlocked” is shown in hidden phonemenu(dial 3845#*880#) using fastboot oem unlock, we got access to install boot.img and recovery from root shell in recovery or during regular bootup.
updated – now uses latest 184.108.40.206 + fixed adb usb in recovery when connecting to pc.
– unlock bootloader , if you got a EUR-xxx in Settings->about phoné->software version, otherwise it seems you cannot unlock your model.
(adb reboot-bootloader ; fastboot oem unlock -> enable unlock -> wait 30sec -> remove battery)
For a complete detailed instructions head over at XDA’s original thread.