Update LG G3 D855 to Android 5.1.1 Lollipop with CM12.1 ROM

CyanogenMod 12.1 (CM12.1) has been released for LG G3 D855 model and in this post, you will learn how you safely update your LG G3 to Android 5.1.1 Lollipop using the recently released CM12.1 ROM.

Update LG G3 D855 to Android 5.1.1 Lollipop

The said custom ROM comes with tons of new features and improvements major of which include performance enhancements and bloatware removal. If you are convinced with features and want to try it on your D855, then you are most welcome to follow the steps mentioned below:

The tutorial we have put together after lot of efforts and time is about installation instructions so you can easily proceed. Meanwhile make sure you are already done with root because here we’ll only discuss installation instructions.

This ROM is only for LG G3 D855 and practicing it on any other device can be fatal for that device. [Verify your phone model from Settings –> About Phone]

Safety Guidelines

  • Make sure your LG G3 D855 is at least 81% or charged.
  • Ensure that you have complete backup of all your important data.
  • Make sure USB debugging is enabled on your smartphone. [If not, enable from Setting –> Developer Options]

Files Required

The CM12.1 ROM (unofficial)mentioned in this post belongs to its respective developer. We are just covering tutorial to help you in its installation which is well-written and very easy to understand. However if you damage or brick your phone, AndroidsDNA.com cannot be held responsible.

How to Update LG G3 D855 to Android 5.1.1 Lollipop with CM12.1 ROM

Step 1: Download the custom ROM and GAPPS. For easy browsing, place both the downloaded zip files on desktop of your Computer.

Step 2: Connect your LG G3 D855 to your computer to transfer the download zip files to your phone SD card.

Step 3: Turn Off your phone and boot it to recovery mode.

Step 4: In recovery mode, first tap on “wipe data factory reset” option to perform a factory reset. Once this is completed, go to advanced options and select “wipe the cache” followed by “dalvik cache” options to clear the cache.

Step 5: Go back to main recovery menu and select “Install zip from sd card” followed by “choose zip from SD card” and select the ROM zip file you have transferred to SD card in Step 1. Once ROM flashing is completed, repeat the same step for GAPPS.

Step 6: Repeat the above step for Google Apps (GAPPS) installation.

Step 7: Once the installation is completed, go back to main recovery menu by selecting “+++++Go Back+++++” option  and reboot your phone by choosing “reboot system now” option from main menu. For the first time, your phone might take little more time than it usually takes, so don’t be panic as it is normal and will be only for 1st time.

That’s it. You LG G3 D855 should be now running latest Android 5.1.1 Lollipop, thanks to CM12.1 Lollipop custom ROM.