Use the physical joystick button under the TV. You can navigate menus and confirm selections with it. Press up/down/left/right to move, and press inward to select.
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He pressed the Settings button (the gear icon) and a side menu appeared. Max navigated down to the bottom and selected All Settings . How to Hard Reset LG 43LK5900PLA
This method is for extreme cases where the TV won’t boot at all. It requires a standard LG remote (not the Magic Remote). Use the physical joystick button under the TV