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Congrats on your M235i! Nice list of previous cars too!
I had trouble with the garage door opener too (I have the rolling code type of opener). After a bit of trial and error, I was able to get it working with these steps:
1. Hold the 1 and 3 buttons on the mirror until the light on the mirror flashes rapidly to reset any existing codes
2. Take your garage opener's remote and hold it a couple inches away from your mirror and hold the button on your remote (for the door you want to open) at the same time as the button you want to use it with on your mirror. Hold this until the light on the mirror changes (I can't remember if it goes solid or blinks rapidly).
3. Go to your garage opener and look for the learn button and push it. Within 30 seconds or so, get to your car and hold down the button you were pushing in step 2 for a few seconds (repeat as often as needed until your garage opener responds).
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