I tried to update several times and it didn't work. Finally I chose another USB port on my PC and then it worked.
I's an up to date PC and I use it as production PC and it works generally well. It has several USB 3.0 ports.
I know, that these ports are partially connected to an internal hub on the mainboard and some are not.
It's not described in the mainboard manual, which ports have a direct internal connection.
I assume, that this had an impact.