Download CM12 (Nightly) For LG G3 D850 (AT&T) Android 5.0.2 Lollipop

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You can now update LG G3 D850 (AT&T) to latest Android 5.0.2 Lollipop. However, its not using official firmware but custom one. The custom ROM we talking about is CM12 (nightly). The ROM is rolled out by CyanogenMod team, and comes with various customization apart from Android 5.0.2 Lollipop features. Having CM12 (nightly) surely give your LG G3 D850 (AT&T) boost in performance, hence a better user experience. Since this is a nightly build, you should expect some bugs here and there but that will be fixed soon. Continue reading this tutorial to know steps that help you to flash CM12 (nightly) on LG G3 D850 (AT&T).

Few cool Android 5.0.2 Lollipop features are – Material Design, a new lock screen, Lock screen notifications, Hide sensitive content in notifications, battery-saver mode, Priority Mode, Guest Mode, Pin Apps, Ambient Display, Double tap to wake, Trusted Device for Bluetooth and NFC, improved Quick Settings and many more.

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Warning!

This tutorial is only for LG G3 D850 (AT&T). Don’t try this guide on any other Android device. Also, we (PrimeHowTo) are not responsible for any damage caused due to the instruction given in this page. Try this at your own risk. However, it is very unlikely that your device will be damaged if you follow all the instructions as it is which are mentioned in procedure.

Pre Requisites:

1. It’s advisable to backup your data prior flashing. I recommend app Helium for this purpose, however you can use any other preferred backup app. [General Guide]

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2. Make sure your device have enough battery power (at least 50% battery power) to avoid any accidental brick. You can install an app like Battery Notifier BT Free on your Android device to check it easily.

3. You must have USB Driver Installed for LG G3 D850 (AT&T) in your PC. If you manage to access your phone data after connecting to your computer then you already have USB driver installed. [Download Driver Manually]

4. Make sure USB Debugging is enabled otherwise it’s won’t be possible to transfer file between PC and LG G3 D850 (AT&T). By default its enabled, so you don’t have to worry. [General Guide]

5. Your device must have latest available custom recovery installed. [General Guide]

Hope, you already checked all pre-requisites. It’s time to follow the step-by-step guide on how to install Android 5.0.2 Lollipop based CM12 (nightly) ROM on LG G3 D850 (AT&T).

File Required(Download by clicking on it)

  1. CM12 (nightly) For LG G3 D850 (AT&T) [Filename: cm-12-20150129-NIGHTLY-d850.zip]
  2. Google Apps [Filename: gapps-lp-20141109-signed.zip]

How to Install Android 5.0.2 Lollipop based CM12 (nightly) ROM on LG G3 D850 (AT&T)

  1. Transfer downloaded file to your Android device by connecting to PC. Make sure you copied all files on SD Card (avoid coping within folder). Important: Don’t extract any files.
  2. Disconnect your device from computer and then turn off your LG G3 D850 (AT&T).
  3. Now, boot into recovery mode. To do so, press and hold Volume down & Power, when the LG logo appears release and press them again, then press the Power button three times. In recovery use Volume Keys to navigate between option and Power to select an option.
    1. You can also try: How To Boot Into Recovery Without Key Combination
  4. First of all create an image of your existing OS by performing Nandroid backup of your existing ROM which you can restore later if this new ROM don’t perform the way you want or if there any glitch. To do so, select Backup and Restore, then on the next screen, select Backup again. Go back to main recovery menu after backup is complete.
  5. Now, perform data wiping task. To perform this, select wipe data/factory reset, then select Yes on next screen to confirm your action. Wait few minutes till the data wipe is complete. Now come back to CWM recovery main menu. Select wipe cache partition and after wiping process done, select Wipe Dalvik Cache under advance option to perform Dalvik cache wiping. Perform this step 3 times to avoid any bootloop issue.
  6. Select install zip from sdcard, then select choose zip from sdcard. Now, locate the CM12 (nightly) Zip file that you copied earlier in Step 1 and select it by pressing Power button. Confirm installation by selecting Yes – Install _____.zip on the next screen. The ROM installation will begin.
  7. Once the ROM installation process end, repeat the Step 6 but choose the gapps-lp-20141109-signed.zip file instead of ROM zip to install the Google apps package.
  8. When installation is completed, perform the Step 4 one more time and then go back to the main recovery menu and select reboot system now to reboot your LG G3 D850 (AT&T) and boot into Android 5.0.2 Lollipop ROM CM12 (nightly).
  9. Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select backup and restore then restore your previous ROM by selecting it from the list.

Tutorial For TWRP Recovery Users:

  1. Transfer downloaded file to your Android device by connecting to PC. Make sure you copied all files on SD Card (avoid coping within folder). Important: Don’t extract any files.
  2. Disconnect your device from computer and then turn off your LG G3 D850 (AT&T).
  3. Now, boot into recovery mode. To do so, press and hold Volume down & Power, when the LG logo appears release and press them again, then press the Power button three times.
    1. You can also try: How To Boot Into Recovery Without Key Combination
  4. Create a Backup using TWRP Backup Option.
  5. Perform a Factory Reset (this will delete all apps and their settings and game progress). To do this, Tap on Wipe, then at the bottom of the screen do a Swipe on the ‘Swipe to factory reset‘ option.
  6. Now add zip file for flashing. to do so, tap on Install, then browse to the location where you saved the files and tap on the CM12 (nightly) Zip file. Then tap on Add More Zips, and add gapps-lp-20141109-signed.zip. Now at the bottom of the screen, do a swipe on the Swipe to confirm flash option to begin flashing.
  7. When installation is completed, go back to the main recovery menu and tap on Reboot and then, tap on System to reboot your LG G3 D850 (AT&T) and boot into Android 5.0.2 Lollipop ROM CM12 (nightly).
  8. Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select Backup then through Restore option, restore your previous ROM by selecting it from the list.

That’s it! You just learned how to update your LG G3 D850 (AT&T) to Android 5.0.2 Lollipop custom firmware using CM12 (nightly). Explore the latest Android 5.0.2 Lollipop based CM12 (nightly) ROM.

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