Tried the link. No avail. Again most of the link/videos refer to some sort of blinking light within the car that confirms delation of old code and or readiness to receive new codes. Dispite every combination of buttons pushed/duration I don’t see any blinking lights. I’ve also tried the learn button and returning to car thing but again I seem to receive no feedback from the car or the garage door opener. This makes me wonder if the door opener( the car one) is defective some how. I have a chamberlain HD420EV. Garage door unit. [img]webkit-fake-url://882538d8-f870-4250-ae76-ce6f5c983e97/imagejpeg

I need an out side the box answer as I’ve chased down most available leads thanks again