How to Flash a Custom ROM on the LG Optimus G (AT&T)

A custom ROM is a custom version of Android for your device. After you have rooted your device and flashed a custom recovery on it, you can then use the recovery to flash a custom ROM. Thanks to a sizeable community of developers, there are a lot of these third-party ROMs to choose from (depending on the device) and each one is unique. Developers usually give you the latest version of Android in their ROM, their own custom themes, options, and a ton of other customization options and enhancements.

In this procedure, we’ll show you how to flash a custom ROM on your LG Optimus G (AT&T).

After flashing a custom ROM on LG Optimus G (AT&T), you’ll be able to:

• Flash newer versions of Android that the manufacturer hasn’t provided yet.
• Utilize different UI skins or stock Android(HTC’s Sense UI, Samsung’s TouchWiz UI, LG Optimus UI).
• Increase performance
• Increase battery life
• More customization options than stock ROMs

Interested? Here’s how to flash a custom ROM on your LG Optimus G (AT&T):

I. Before You Begin

1. You must be rooted to do this tutorial. Head to our Rooting How To’s section, find your device, and do the How to Root tutorial listed for it there then return to this tutorial to continue.

2. You must also have a custom recovery flashed on your device before doing this tutorial. Head to our Rooting How To’s section, find your device, and do the How to Flash a Custom Recovery tutorial listed for it there then return to this tutorial to continue.

II. Choose a Custom ROM to Flash

1. Head to our ROM repository and choose your device.

2. Choose a ROM of your liking.

3. Click the download link in the ROM post to be taken to the developer’s page for that ROM.

4. Search through the developer’s page for the download link for the latest version of that ROM (usually located in the first post in a forum or under Downloads).

5. Save the ROM to your desktop of your computer.

III. Flash the Custom ROM on your LG Optimus G (AT&T)

1. Connect your device to your PC via USB cable.

2. Copy the Custom ROM .zip file from your desktop over to the root of your SD card.

3. Once it’s been copied, disconnect your device from your PC.

4. Head over to the Google Play and download and install Quick Boot on your device.

5. Launch the Quick Boot app from your App Drawer.

6. Tap Recovery in the app and it’ll reboot your device into recovery mode.

In the recovery mode, the Volume buttons are used for navigation and the Power button to make a selection.

7. Select Backup and Restore.

8. Select Backup.

9. Hit Yes when prompted and wait for it to backup your device.

10. Once done, head back to main menu by selecting Back.

11. Select Wipe data/factory reset.

12. Hit Yes when prompted and let it wipe off your device.

13. Once done, head back to main menu by selecting Back.

14. Select install zip from sdcard followed by choose zip from sdcard.

15. Choose the Custom ROM .zip file you copied earlier to be flashed on your device.

16. Select Yes when prompted if you really want to flash the selected ROM on your device.

17. It’ll start flashing the ROM on your device.

18. Once the ROM has been flashed, reboot your device by selecting reboot system now.

19. You’re all set!

IV. Flash Another Custom ROM (Optional)

1. After your have a custom ROM on your device, you can always repeat this process to flash another one and try out different ones until you find one that suits your needs.

By the way, don’t be scared, you can always put your device back to stock by heading to our Rooting How To’s section, finding your device, and doing the How to Unroot tutorial listed for it there.