There is a round hole with reset button inside. Use a pen or paper clip to hold the button for 15 seconds. You will see the LED light blink red every two seconds.
I have GDB Remote 2.0, how do I factory reset the device?
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These openers are NOT compatible. 1. Liftmaster/Chamberlain/Craftsman/Raynor security+2.0 openers are not compatible. If the learn button on your Liftmaster/Chamberlain/Craftsman/Raynor is yellow, that means it is security+2.0. To support these openers,