What to Check First
- Software Version History.
- From the Home Screen, tap Apps > Settings > General tab > About phone.
- View the current software under Software version .
- Software version LS991ZVi - Release date September, 2017 Android Security Update (2017-09-01).
- Software version LS991ZVG - Release date June, 2017 Android Security Update (May 2017).
- Software version LS991ZVF - Release date April, 2017 Android Security Update (2017-03-01).
- Software version LS991ZVE - Release date February, 2017 Android Security Update (2017-01-01).
- Software version LS991ZVD - Release date December, 2016 Android Security Update.
- Software version LS991ZVC - Release date July, 2016 Google Security Patch.
- Software version LS991ZVB - Release date April, 2016 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 SPRINT - LS991 SOFTWARE UPDATE?
Software Version History.
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.