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no you cannot use just any QS device on a BMW. That is a CAN BUS base module on the 15 and newer.

You did not mention if adaptations were reset. that is the first thing that should have been done.

Also the transmission position sensor can be bad and not show a fault code. Issue can be like you indicate a non working QS in just some gears.
 

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Sorry, you have way too many problem parameters to help remotely over the internet. you will need a GS911 and work this issue yourself.

Another try of IF its the problem.. put the stock tune back in and see if the QS works fine. well, if the stock tune works you have direction on the issue and its not hardware.
 
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