Always using for updates of sys-usb the following commands in Terminal in 
dom0:

Just a restart:
qvm-shutdown --wait sys-usb; qvm-start sys-usb


A change of the (already installed) new template, when all other vms 
already working with this new template:
qvm-shutdown --wait sys-usb; qvm-prefs -s sys-usb template <new-templatename
-number>; qvm-start sys-usb


So for an update to Fedora-32 it would work with:
qvm-shutdown --wait sys-usb; qvm-prefs -s sys-usb template fedora-32; qvm-start 
sys-usb


Sometimes it crash and the cube won't starting proper again, so I have to 
turn the machine off and start new, but in 80% of the cases it's working 
this way.
The changes definitely are done in all cases, so you will run your sys-usb 
with the new Ttemplate then.

Cheers Steffen :)



Am Donnerstag, 28. Mai 2020 20:34:40 UTC+2 schrieb Zbigniew Łukasiak:
>
> My sys-usb uses a very old template. I tried some googling - but 
> failed to find any advice about update it without locking me out of 
> the system. 
> I guess I could remove it - there is a description on how to do that 
> in https://www.qubes-os.org/doc/usb-qubes/ - and then add it again 
> with a new template. But it is kind of complicated and looks 
> dangerous. 
>
> -- 
> Zbigniew Lukasiak 
> https://medium.com/@zby 
> http://brudnopis.blogspot.com/ 
>

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