What to Check First
- From the Home Screen, tap Apps > Settings > General Tab > About phone.
- View the current software under Software version .
- Android Marshmallow, software version US99125a - Release date April, 2017 Android Security Update (03-01-2017).
- Android Marshmallow, software version US99124a - Release date February, 2017 Android Security Update (2017-01-01).
- Android Marshmallow, software version US99123a - Release date December, 2016 Android Security Update.
- Android Marshmallow, software version US99122a - Release date August, 2016 General maintenance.
- Android Marshmallow, software version US99120c - Release date February, 2016 Android Marshmallow 6.0 Software Update (only if not already updated).
- Android Marshmallow, software version US99120b - Release date January, 2016 Android Marshmallow 6.0 Software Update.
- Android Lollipop, software version US99110d - Release date September , 2015 Security updates (including Stagefright).
- Android Lollipop, software version US99110c - Release date June , 2015 General maintenance.
Why This Can Happen
Symptoms can have more than one cause, and the correct steps depend on the exact model, installation and operating conditions. Use the checks above to narrow the issue before service.
Safety and Model-Specific Guidance
Stop troubleshooting if you notice burning, electrical damage, unsafe heat, gas odor, refrigerant concerns, or water near electrical components. Follow the official LG USA instructions for your exact model.
Frequently Asked Questions
What should I check first for LG G4 - US991 SOFTWARE UPDATE?
From the Home Screen, tap Apps > Settings > General Tab > About phone.
When should I stop troubleshooting and contact LG?
Stop if the product shows signs of electrical damage, burning, leaking near electrical components, or if the recommended checks do not resolve the issue. Use LG USA support for model-specific service guidance.
Does this guidance apply to every LG model?
Not always. Controls, error codes and service steps can differ by model. Confirm the exact model number and follow the linked LG USA article for model-specific instructions.