After upgrading the EliteOne 800 G1 to BIOS version 2.77 the system is no longer able to play audio.
Normally using Windows 10, I have checked everything and also tested with Linux livecd distros where audio is not playing too. This is just to rule out driver issues etc.
The system will show like audio is playing based on dynamic volume graphs, but there is no audio coming from built in speaker or neither if I plug in external headset or speakers into jack.
Inserting an external USB soundcard works of course with audio coming from external soundcard.
I updated the PC according to the SoftPaq SP96014 published, however I can see today it looked like the 2.77 BIOS has been pulled, since all of sudden only an old BIOS 2.70 from 2016 (SP77880) is available.