Now, you will need to pull the battery if you want to reboot without installing anything. As a word of warning, do not unplug the USB cable while anything is being flashed/installed onto your device. This is the LG G4 Download Mode that you are looking for and it is here that you will be able to do things like manually flash a firmware image, downgrade, revert to stock, etcetera. After you hold this for a few more seconds then you should see it boot up into a ‘Firmware Update’ page.
If you’re watching the screen, you should see a Download Mode screen appear and if you do, continue holding the Volume Up button. Plugging in the USB cable basically signals the LG G4 to turn on and while that is happening, if the cable is plugged in while the Volume Up button is pressed then it should boot you into the LG G4 Download Mode. This doesn’t have to be done in any amount of time. Once the LG G4 is off, press and hold the Volume Up button and while that button is held down, plug the USB cable into the bottom of the phone.
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