Huh.

Did they say there was a software 'fault', such that the DME was corrupted and needed to be re-programmed?

Or is there a new version of software (hadn't heard of this).

BMW dealers cannot 'change' software content- they load in approved programs and that is it- no twiddling with values, tables, etc.

Or did they just clear the fault and call that "reprogramming'??

If it comes back on, look for a intake air leak....