All,
quite the standard setup. Updated software to 9.5 on my MacBook Air, connected Mini Extreme ISO with known good USB-C cable (Lenovo Thunderbolt 3 cable), started update process.
At 57% Extreme ISO stops the fan, switches row of up/down lights on, update fails.

- Update failed
- UpdFailed.jpeg (915.7 KiB) Viewed 6064 times
After that, device is not usable, seemingly broken.
Also tried:
- Switch ATEM on with MIC1 ON pressed to get into firmware update mode, tried to update, same symptoms.
- Downloaded software again, same symptoms.
Downgrading back to the 9.3 software (and thus firmware 8.6.1) seems to work, so I can at least use the switch, but an update seems to be impossible.
How can I fix this? Is this a known problem?