Issues Programming Garage Door Opener - broken button



I am a new E55 AMG owner as of about 3 weeks ago. Love the car! One issue I am having is I cannot get the integrated garage door opener to program. The previous owner told me when I bought it that the 1st button (left) was not working but that he was able to program. I have tried and having no luck. According to everything I read, you press and hold the 2 outer buttons to clear the memory. Then you can program up to 3 buttons. Well, since that 1st button is failing, I might be out of luck....but previous owner got it working. From the manual, it sounds like you don't need to clear the memory if there are other 'un-programmed buttons.' I attached a screenshot of the instructions and it says "If you later wish to program and 2nd or 3rd button, don not repeat this step and go the step 3." I wonder if the previous owner(s) programmed all 3 buttons and now since I can't clear the memory, there are no free buttons to program myself?
I hold my garage door opener right next to it and follow the steps and it does flicker slow , then fast, then I release. But it is not opening my garage. Am pressing the large button.
I suppose I could buy a new mirror - trying to avoid that.
See pics below of my opener (if that helps) and the manual.
Thanks for any input!
I had to program mine by resetting the codes, both outer buttons. Then push the garage door program button. Then push the button you want to program twice for the 3 seconds each. That' only gives it the ID of your garage door. Then you have to program it again by doing what your doing currently , but don't reset the codes again. - I believe that's what I had to do to finally get it to work. If it doesn't try using the program button again for the second part.



I had to program mine by resetting the codes, both outer buttons. Then push the garage door program button. Then push the button you want to program twice for the 3 seconds each. That' only gives it the ID of your garage door. Then you have to program it again by doing what your doing currently , but don't reset the codes again. - I believe that's what I had to do to finally get it to work. If it doesn't try using the program button again for the second part.



