Tips & Tutorials

Update LG Optimus Black P970 to Android 4.2.1 CM10.1 Jelly Bean Nightly Custom ROM

HOW TO: Install Android 4.2.1 CM10.1 Jelly Bean Nightly on Optimus Black P970

We have put together a detailed step-by-step instructions guide on how to install Android 4.2.1 CM10.1 Jelly Bean Nightly on LG Optimus Black. If you are used to installing custom ROMs on your LG Optimus Black, then this should not be any different for you.

However, for beginners, you need to root your LG Optimus Black and install a custom recovery. Please Google that up if you are unsure. Make sure you read the entire tutorial first before actually performing it.

LG Optimus Black - Android 4.2.1 CM10.1 Jelly Bean Nightly

To Remember:

  • This tutorial is only for installing Android 4.2.1 CM10.1 Jelly Bean Nightly on LG Optimus Black P970. Please do not try on any other Optimus Black variants.
  • Your phone SHOULD be rooted.
  • This tutorial will wipe out all your data. Proceed at your own risk.
  • Perform a Dalvik Cache wipe before proceeding from the recovery mode.
  • ClockworkMod recovery should be installed from before.
  • Make sure you backup all your data in your phone before proceeding.

Complete Step-By-Step Instructions:

Step 1 – Download Android 4.2.1 CM10.1 ROM and Google Apps for Optimus Black P970 to your computer.

Step 2 – Connect and mount your Optimus Black USB memory on your computer using the USB cable.

Step 3 – Now copy/paste the downloaded Android 4.2.1 ROM zip file and Google Apps zip to your SD card. Make sure the file is in the SD card root (not in any folder).

Step 4 – Then turn OFF your phone and disconnect from the USB cable.

Step 5 – Now to get in the Recovery Mode. Switch ON the phone and wait till the 4 LED lights start to flash. As soon as they flash, press the G-button repeatedly on your phone until the phone reboots and you are in the CWM Recovery Mode. Alternatively, read this: How to Enter Recovery Mode on Any Android Phone.

Step 6 – In ClockworkMod recovery, perform a full data wipe first. Then scroll down to “flash zip from SD card” and press the Power button to select it.

Step 7 – Press the Power button again and select “choose zip from sdcard”.

Step 8 – Now using your volume keys, navigate to the Android 4.2.1 ROM zip file that you copied to your SD card and select it using the Power button. Confirm the installation on the next screen and the installation procedure should start now.

NOTE: Repeat this step again for the Google Apps zip file.

Step 9 – After the installation completes, go to “+++++Go Back” and reboot the phone by selecting “reboot system now” from the recovery menu. The phone will boot now and it might take about 5 minutes to boot on your first time. So, please wait.

That’s it! Your Optimus Black should now have Android 4.2.1 CM10.1 Jelly Bean Nightly installed on your phone! Go to Settings >About phone to verify.

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If you run into any problems, feel free to drop us a comment below and we will reply you back ASAP with the fix or the solution to your problem.

About the author

Haris Nadeem

He lives on everything Android; has countless devices, apps and games to play with everyday. Currently serving as the Chief Editor at Team Android.