Jozsef,
I'm pleased that it may be of use to you and others.
I received a very prompt reply from Adam Tanner of Bryston who stated "There is probably some file corruption on that SSD that is preventing the Motherboard from booting correctly.
It could even be physical damage to a section of the memory and the drive needs to be replaced.
BUT,
If you are using the unit as a ROON endpoint then that drive is not necessary anyway..."
So, although my use of the streamer is purely as a Roon endpoint (I have all of my music accessed from a NAS drive), the 09 error needed to be solved.
regards,
David