Originally Posted by abieofficial
Just Accidentally flash Jelly Bean rom then knock on did't work and setting dial 5689#*995 then I didn't see setting option and update firmware.
Maybe, if I could flash LS995ZV9 firmware, the knock on would work again.
Hope someone or OP upload the latest firmware for my G Flex.
If you are on ZV3, use Shortcut Master Lite to update touch firmware and get knock on to work. You may or may not require root.
Shortcut Master Lite:
Menu- App explorer - com.lge.hiddenmenu - Launch - Update Touch firmware wait for 5 seconds and reboot