Yamaha FIRESTATION - WINDOWS GUIDE Tutorial page 15

After the installation, your Device Manager should look like this.
(Note)
Don' t worry about the yellow ! by the 61883 Class Bus Device.
This is normal and should be here. This is a firewire data stream standard.
There is a yellow ! by it because Windows thinks it needs a driver. It
doesn' t because the mLAN protocol is using it to stream data.