Last Updated on March 31, 2017 by Mathew Diekhake

The LG G4 for T-Mobile subscribers can now be updated to the latest Android 6.0 Marshmallow with the help from a new custom ROM based on the stock ROM. Android 6.0 Marshmallow is the latest software update by Android and only running on a select few devices. We saw it arrive out of the box in the latest couple of Google Nexus devices just released. Now you can get all the same features via a custom ROM made by third-party developers.

LG G4

The Files You Need

  • Download the Android 6.0 Marshmallow for your LG G4 smartphone from this hosting page here.
  • Download the Patch you need from the hosting site here.
  • The following guide gives you an Android 6.0 Marshmallow custom ROM based on the Marshmallow stock firmware build that would be coming to your device. As such, you do void any warranty by installing a custom recovery, followed by a custom ROM.
  • You must have a custom recovery installed before you can follow this guide. It doesn’t matter what version of custom recovery you have. Likely you’ll need to choose from the recovery that is available, whether it be Philz Touch recovery, TWRP recovery or CWM recovery.

Updating the T-Mobile LG G4 with Android 6.0 Marshmallow

  1. Download the two files from the files section above directly to the computer. Now transfer the files to the desktop.
  2. Connect the LG G4 smartphone to the computer and transfer those files to the internal storage SD card on your phone.
  3. Unplug from the computer once you know the files are on the SD card. Make sure they are on the root of the SD card, which is the topmost folder. If you hide it in a sub folder, you might not find it again later when you try to install the file.
  4. Completely power off the LG G4 smartphone.
  5. Reboot the LG G4 to recovery mode.
  6. Take a NANDroid backup or else you will lose the data on the next step.
  7. Choose to wipe data/factory reset.
  8. Optional but recommended: wipe the cache partition and dalvik cache.
  9. Choose the ‘Install” option from the main recovery menu.
  10. Browse the SD card and install the Android 6.0 Marshmallow file.
  11. Go back and browse the SD card again; this time for the Patch file.
  12. Once you have loaded both the files, go back and select the reboot system now option from the recovery menu.