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Rooting an LG G3 and Flashing the Fulmics ROM

I’ve been disappointed with the performance of my LG G3 (D850) for some time now. Swiping from screen to screen was laggy. It would fail to connect to the Bluetooth in my car. Apps would hang for almost no reason. It was not fun to use anymore. So, I did a factory reset on it. That’ll fix things, right? No. My phone was just as bad as it was before wiping all of my apps and settings.

So, I put the phone away for a while and switched to a Nexus 5. I greatly enjoyed Marshmallow and the clean Nexus experience. Not having McAfee on my phone was a plus, too.

But alas, I pined for the power of my G3. Having a working phone in my possession, I decided that I’d try rooting the phone and flashing the Fulmics ROM that everyone on /r/lgg3 seems to be raving about.

Step 1: Rooting the Phone

It took me a few attempts, but here’s what I found to work.

  1. Enable Developer Options and USB Debugging.
  2. Attach your phone to a Windows computer with the LG drivers installed.
  3. Download and extract the following zip file: (Mirror)
  4. Run the root.bat script and follow the on-screen instructions.

While not likely to be needed, additional instructions can be found here.

Step 2: Installing TWRP

TWRP is Team Win’s recovery partition that allows for the backing up of the phone and installing custom ROMs. Once rooted, this can be installed via the Play Store. Once you launch the application, SuperSU will notify you that it needs permissions to access your phone’s storage. You’ll need to allow this for TWRP to be installed.

Step 3: Backing Up Your Phone

Turn off your phone. Ensure you have a micro SD card inserted.

Boot into Recovery Mode by holding down the Power and Volume Down buttons until the LG logo appears. Quickly release the power button, then hold it down again.

Click on the Backup menu option, choose Advanced, then select all of the items for backup. Ensure your backup is going to your SD card, then start it by swiping at the bottom of the screen.

Check all of the boxes, not just the ones shown here.

Once this completes, shut down your phone (Reboot -> Power Off), remove the SD card, connect it to your computer, and copy the backup onto your hard drive.

Step 4: Install Fulmics

On the Windows computer, with the SD card still attached, go and download Fulmics 4.1. Once the download completes, copy the zip file to the SD card, then put it back into the phone and again boot into Recovery.

Click the Install button and select the zip file. This will launch the Aroma Installer for Fulmics. When you get to the Select Your Device screen, ensure that you select the proper one. Selecting the wrong model will likely brick your phone. As I have an AT&T D850, that’s what I selected.

The rest of the installer presents you with the opportunity to remove bundled applications (i.e. carrier bloatware) and install additional Fulmics packages (which can be installed later). The choice is yours on these.

When this is complete, reboot your phone into your new, working Fulmics ROM. Initial boot will take some time, but you should see indications of Fulmics in the splash screens.

Published inSmartphones