You can use these official firmware to :
- Unbrick LG G4 US991 (US Cellular)
- Updates LG G4 US991 (US Cellular) to Android 6.0 Marshmallow
- Downgrade/Rollback LG G4 US991 (US Cellular) USA Sprint to Android 5.1.1 Lollipop
- Flashing LG G4 US991 (US Cellular)
- Hared Reset / Restore LG G4 US991 (US Cellular) to 100 % stock factory
- Unroot LG G4 US991 (US Cellular)
- Repair solutions for LG G4 US991 (US Cellular) if boot loop, Hardbrick, Lost recovery, or stuck on logo and we know that this is not a problem with the machine or Hardware, but only software. Usually occurs because installing false ROM/firmware, conflict in system/data, overclocking CPU or infected Virus.
- How to install LG G4 US991 (US Cellular) Firmware → Read Here
- Download LG G4 Firmware based Versions : H815 (EMEA), H815AR, H815TR (Turkey), H815L (Israel), , H815P (LATAM, South Africa), H815T (Australia, Hong Kong), H812 (Canada), H810 (US AT&T), H815K (Australia, Israel), H811 (USA T-Mobile), LS991 (USA Sprint), US991 (US Cellular), VS986 (US Verizon).
- All LG Mobile Phone Firmware / Stock Rom → Download here
- How to root LG G4 USA → Read Here
- LG G4 US991 (US Cellular) Full phone specifications –> Read Here
LG G4 Firmware (Stock Rom) Device Model : US991
||Firmware Version||Release date
|LG G4 US991 (US Cellular)||6.0 Marshmallow||US99120a||August, 2016||Download||General maintenance|
|LG G4 US991 (US Cellular)||6.0 Marshmallow||US99120c||February, 2016||Download||Android 6.0 Marshmallow Software Update “only if not already updated”. General maintenance|
|LG G4 US991 (US Cellular)||6.0 Marshmallow||US99120b||January, 2016||Download||Updates to Android 6.0 Marshmallow|
|LG G4 US991 (US Cellular)||5.1.1 Lollipop||US99110d||September, 2015||Download||Security updates “including Stagefright”, General maintenance|
|LG G4 US991 (US Cellular)||5.1.1 Lollipop||US99110c||June,2015||Download||General maintenance|
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