It would ne nice if the behaviour could be reproduced. This will of course not be possible as ETS will refuse a new download because of the incompatible manufacturer code between device and application.
I assume it is best you contact the manufacturer about this problem. Possibly, it is known that certain circumstances lead to this behaviour. ETS will of course never intentionally change the manufacturer code. From KNX support, it is now rather difficult to help, I guess. You need to contact the manufacturer anyhow to check how you can correct the manufacturer code again.
Mr. Steven De Bruyne
System Department - KNX Association
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