Hi all,
anyone had the guts to try it?

For me it worked. Tried only my trusty old 1st-gen Babyface, which I don't really need at the moment, but it seems like the whole thing worked just fine - well at least redirecting physical USB device in KVM hypervisor config, the guest OS (non-activated Win11 for free) did recognize it, installed RME driver, FUT, TotalMix, DigiCheck... seemed fine before and after the update too, even TM popped up when I virtually plugged the USB in from host to guest. Didn't measure the latency, but that wasn't my point anyway, only updating firmware. On a non-virtualized Windows all seemed fine afterwards. Then back to CC on Linux I'm all happy too.

Was wondering if such a FW update worked for anyone else, possibly with non-USB devices.