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This is only my understanding of it - as there was another user (I believe it may have been on reddit) successfully got a mobile tech to update the software. It remaps the fans regardless of if you are using the button or not. Similar to your example - where a fan level "5" is now an "8", etc...

After retrofitting the hepa filter, airflow is severely restricted. Especially when not on "auto" fan mode. To the point it's almost unusable. The software update for BDM doesn't just add the button, but also "re-maps" the fan settings to adjust for the restricted airflow. This is the main...

I have a feeling this is due to the Setting under "Settings-Sounds & Haptics-Headphone Safety-Reduce Loud Sounds" I used to have this issue when I played over BT from the native app, but now I use the built in app over premium connectivity.

Here's the thread I used for mine - they offer two different solutions. The tow brake solution seems to only work if you have the tow package purchased. Otherwise there is a wire under the passenger footwell (I've used this option successfully) 12v switched power for Radar Detector

No, with auto it still has the reduced fan speed. I'm guessing in the software it is set to blow at certain speeds with certain temperature differentials. See a few posts above, there is a guy who got mobile service to manually enable BWD. Airflow increased after the software change

Just picked up my parts here in Chicagoland area, without issue. Took a couple of weeks, including a week delay, to get them. Will be installing on a 2020 using instructions given here - thanks all.

Do you recall what chat menu options you used? I've tried both "Vehicle & App Features" --> Software & Firmware as well as Touchscreen - neither had any idea what I was talking about

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