Hi,
Remove this if not allowed, but as the BM/BS5 are now discontinued by B&O, to recover from a failed disk or motherboard you need the service tool. I got this from Gerard, but he couldn't put it in a easily accessible place.
It can be found here:
https://rapidgator.net/file/8c4a5985b0c5112b1afc058c7c1f3ace/BS5-BM5_ST.zip.html
It's 1.7GB in size
In addition, here is the software to allow Airplay to be active on the system - Shairport:
https://rapidgator.net/file/38ea03b1846b0d67f37086f16893de77/SP4W88_Setup.exe.html
and finally, a troubleshooting guide and the Firefox browser that will work on the system