For my 650i, I use both BimmerCode and BimmerLink. You can turn on/off/auto exhaust flaps through BimmerLink, but it always adjusts back to close when you turn off the vehicle. So you'll just have to use the app every time you want it open.
I use the same Bluetooth adapter as you, it works fine.
I just flashed Bootmod3 stage 2 as well and that has an option to open exhaust valves when the car is put in Sport/Sport+ which is a little more convenient.
Edit: the exhaust valve open in sport/sport+ mode isn't working
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