Update LG Optimus G E975 with Nightly CM10.2 Custom ROM (Android 4.3 firmware)

The Android 4.3 Jelly Bean based CM10.2 custom ROM platform is being provided for more and more devices, as now if we count the official and unofficial releases of the firmware, almost all the Android based handsets from the market can be optimized with the new and latest version of CyanogenMod. Well, the LG Optimus G E975 just received the same, so during this guide I will show you how to easily install CM10.2 custom ROM on Optimus G for updating to custom Android 4.3 Jelly Bean OS.

CM10.2 comes with all that’s new on the Android platform along with other capabilities and apps as the firmware is including stock and extra features. So, by flashing the CM10.2 custom ROM on your LG Optimus G you will be able to receive a custom version of Android 4.3 Jelly Bean that can be optimized depending on what you want to obtain. Therefore, you can easily use CM10.2 software for increasing the speeds, upgrading the battery life or even for improving the performances of your Optimus G. Of course if you want to take full advantage of your handset, after installing CM10.2 also add a custom kernel and overclock your Android device.

I know that the Optimus G is a high end handset that comes with decent to impressive performances, but these performances are limited by the factory restrictions. So, in order to unleash the full power of your phone, you first have to unchain its system by removing the default restrictions. This can be done via root access. The same root access is required for the present operation as CM10.2 can’t be installed on a locked LG Optimus G E975; therefore you have all the reasons for gaining root access before going any further.

Be careful when doing the same because the warranty of your smartphone will get void. Gaining root access and also updating with custom ROMs represents unofficial operations which will make the warranty lost. Use suitable guides when applying the mentioned procedures, or else you can end up in bricking your Android based smartphone / tablet. Don’t worry though because you can choose to restore the warranty this being possible as soon as you downgrade your Optimus G to stock Jelly Bean OS, or when updating with an official release of the Android system – hopefully Android 4.3 soon.

On the other hand, after gaining root access a custom recovery image, such as CWM recovery will be required. The CM10.2 update can be flashed only via CWM recovery, so you cannot complete this step by step guide without replacing the stock recovery with a custom one. Also, the recovery image will be used for wiping the system of your phone. Therefore, before starting the update operation, the best will be to backup the Optimus G data because everything that’s saved on the internal storage memory will get wiped out. Use the recovery image once more for making a Nandroid backup and for saving the EFS folder and use apps from Google Play for saving the contacts, messages, call logs, market apps and so on.

Next, just before heading to the steps from below, ensure that you can use a computer, your phone is charged (more than 60% else you risk in bricking it – if it gets turned off in the middle of the installation procedure) and the USB debugging option is enable don your device (because you need to connect the smartphone with the computer – go to “Settings -> Applications -> Development -> USB debugging”). Now, for avoiding the unpleasant situations from happening, from both computer and Optimus G deactivate or uninstall the antivirus programs; the security protection might interfere with the update operation. Also, ensure to complete this tutorial only for flashing CM10.2 Android 4.3 on the LG Optimus G model number E975 phone; this guide is compatible only with the mentioned device.

How to Update LG Optimus G E975 with Nightly CM10.2 Custom ROM (Android 4.3 firmware)

  1. Download the CM10.2 firmware file from here.
  2. Download Google Apps package from here.
  3. Save both files on your computer.
  4. Don’t unzip the downloaded files.
  5. Connect your Optimus G with the computer.
  6. Use the USB cable for establishing the connection.
  7. Select the downloaded files from your PC and transfer them to your handset.
  8. Then, unplug the USB cable for disconnecting the devices.
  9. Turn off your handset.
  10. Use this guide and learn how to boot your phone into recovery mode.
  11. Then, use the recovery mode for wiping the system – remember to backup the data first.
  12. Wipe the system by selecting “wipe data factory reset”, “wipe dalvik cache” and “wipe cache partition”.
  13. Return to recovery.
  14. And next select “install zip from SD card” and “choose zip from SD card”.
  15. Pick the CM10.2 firmware file from your phone.
  16. Repeat the step for selecting the Google Apps package.
  17. Flash the files and wait while the installation process is running.
  18. In the end, return to recovery and select “reboot system now”.

Good job, CM10.2 has been successfully installed on your LG Optimus G E975. Now your phone is running on a custom version of Android 4.3 Jelly Bean that can be optimized by your own taste. Do note that this is the nightly release of CM10.2 so there might be minor bugs included on the platform. Therefore, test the new Android 4.3 based software and see how the same performs on your Optimus G. Return here and share your results and impressions with us and with our team by using the comments field from below.

LG Optimus G Articles

  • UnicoHijo

    LG OPTIMUS G has no SD card right? So, how can you put the zip file to the phone?