LG G4 US991 unbrick guide: How to use LG UP to unbrick/restore your LG G4 US991 back to stock;
What You need:
- LG USB drivers
- LG UP software
- LG UP DLL for US991: LGUP_8994_DLL_Ver_0_0_3_23.msi
- Latest stock firmware for LG US991: US99124A (as of March 30, 2017) Remember to check and use the most update to date firmware for your phone.
How to use LG UP to flash KDZ firmware
Now you have everything ready, Install the LG USB drivers, LG UP Store and LGUP_8994_DLL_Ver_0_0_3_23.msi
Put your phone into download mode and then run the LG UP
LG up should detect your phone model and software version automatically.
From LG UP main screen, Click “Upgrade” and click “BIN file” to select the US99124A kdz
Click start and wait until the LG up shows it is 100% completed.
LG UP should reboot your phone.
Now close the LG UP, You have your US991 back to work.