I had a similar issue. YouTube videos were a waste of time. I ultimately found that there were two levers on top of the opener and (from the back of the opener looking forward) the lever on the right was moved toward the gear. I rotated it toward the door, plugged the opener back in and it worked. But this is dangerous. You have to be on a ladder holding a flashlight and the top of the opener is close to the ceiling making it tough to see. Also, always make sure the opener is disconnected from power before you work on it.
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