LG Optimus G is LG’s late 2012 flagship phone. It is powered by quad-core Qualcomm Snapdragon S4 Pro processor. The speedy processor is backed by 2 GB of RAM, 32 GB of ROM, a 4.7″ “True HD-IPS+” panel, LTE connectivity, a 2100 mAh battery, and an 8 or 13 MP camera (depending on region). It originally came with ICS OS but it was upgradable to Jelly Bean.

The Sprint variant of Optimus G has received the CM 12 custom ROM. This ROM will upgrade the device to Android 5.0 Lollipop. Its a useful option as Optimus G is not scheduled to receive official Lollipop update. Follow the guide below.

LG Optimus G

Disclaimer: Follow the instructions at your own risk. If the device gets damaged, the writer or the owner of the site must not be held responsible.

Pre-requisites and Backing up your Sprint Optimus G:

Requirements:

Steps to install CM 12 ROM on Sprint Optimus G:

  1. Create a Nandroid backup from recovery, in case anything goes wrong.
  2. Download the CM 12 ROM zip file and Gapps zip file and transfer it to the phone.
  3. Switch off the phone and boot the phone into Recovery mode.
  4. Next, wipe the cache and the dalvik cache.
  5. Now go to “Install zip” and then “Select zip”. Choose the CM 12 ROM zip file.
  6. Now again clear cache and dalvik cache.
  7. Go to ”Install zip”, then “Select zip”. Choose the Gapps zip file.
  8. Then perform full data wipe task. To do so, click “Wipe Data/Factory Reset”, then choose “Yes” on next screen to confirm.
  9. After the process is complete, reboot the phone.

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