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[HOW TO] Upgrade or Downgrade firmware for LG Optimus One


Well-Known Member
Jul 5, 2011
Disclaimer: I will not be responsible for anything that happens to your phone after following this post. You are doing this because you choose to and you alone are responsible for anything that may happen. Use at your own risk.

1. Download KDZ Updater and LG united mobile drivers from here.

2. Extract the rar file and install LG United mobile drivers.

3. Disable all LGE modems under modems from windows device manager.

4. Charge your phone since we cant really tell how much juice is left in the battery even though the screen is on.

5. Download the stock firmware (also known as rom) from Lg


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