CyanogenMod CM12.1 custom ROM brings a few bug fixes and new applications, personalisation options and performance tweaks to enhance user-experience on LG G3 models.
÷ Prerequisites :
•This new CyanogenMod CM12.1 Android 5.1.1 Lollipop firmware has to be installed on the LG G3 (D850/AT&T; D851/T-Mobile; D852/Canada; D855, vs985/Verizon;) models only; if tried on other devices, it might get bricked [To check your device model: Go to Settings >> About phone >> model number]
•Make sure the device is rooted before going forward for custom ROM installation
•Installation of custom ROM requires clearing of memory in the smartphone, so make sure to back all the data by installing Clockwork Mod (CWM) Recovery/ TWRP in the smartphone.
•Users make sure you have installed USB drivers on the PC, or else your smartphone (LG G3) will not be recognised by the computer.
•Make sure your device has more than 80 percent battery, or else there is a chance of smartphone getting temporarily bricked if the installation process is interrupted mid-way.
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Tutorial: Step-by-step installation procedure of CyanogenMod [official] Android 5.1.1 Lollipop CM12.1 custom ROM on LG G3-
Download CM12.1 Custom ROM for LG G3 (D850/AT&T) and Gapps.
Step 1: After downloading the Android 5.1.1 Lollipop CM12.1 custom ROM and Google Apps files in to your PC; connect LG G3 to PC via USB cord.
[Note: Before plugging the phone to the computer, be sure that you have installed USB driver software, if not, click Here to download the firmware].
Step 2: Then, place Android 5.1.1 Lollipop zip file and Google Apps .zip file into the phone's SD card memory. [Note: Users are advised to paste the .zip file in SD card root, not in any other folder.]
[Note: Before installing the custom software, be sure that the device must have been rooted and has installed ClockworkMod Recovery tool.]
Step 3: Now, turn off the device and disconnect from the PC.
Step 4: Then perform the regular Recovery Mode sortie by press holding 'Volume (Down)' and 'Power' buttons.
Step 5: After entering the RECOVERY mode, clear the phone memory, by choosing 'wipe data/factory reset' option.
[Note: use 'Volume' keys to navigate and 'Power' button to select options, while operating under Recovery Mode]
Step 6: Now, clear the cache memory by selecting 'wipe cache partition'
Step 7: Then to go back to ClockworkMod recovery, and select 'advanced' and tap 'wipe dalvik cache' [Note: This step is optional, but many recommend this procedure so that user will not face boot loops or any other errors in the middle of custom ROM installation]
Step 8: Again come back to main recovery screen and then tap 'install zip from SD card'
Step 9: Then tap 'choose zip from sdcard' and go to Android 5.1.1 ROM .zip file in SD card and enter the installation process. Repeat the same procedure to install Google Apps [Note: use 'Volume' keys to navigate and 'Power' button to select options]
Step 10: Once done with the installation process, navigate to '+++++Go Back+++++' and re-start the device by opting 'reboot system now' seen in the recovery menu.
Now, your device (LG G3) will take at a few minutes to complete the booting process.
Users then head to Settings >> select 'About phone' to confirm the installation of CyanogenMod [official] Android v5.1.1 Lollipop CM12.1 custom ROM.