Error message and wrong arrangement play after fw

Dear Support team,
do we have any progress on the Playlist Mute (no Mute) issue meanwhile?
I am asking because as already said: we face a gig at end of the month and currently are unable to use the uTrack24 in the current stage.
Another option: As the uTrack 24 was more reliable working with the older firmware version 2469: Where can I download the older versions (2469) for uTrack 24 from and can the older firmware be applied (downgrade) to the device?

Thanks
-Axel-