I had the same problem. I wiped the card and re-formatted it. My Windows 11 won't do it. I used AOMEI (freeware). Then I copied over the files and put the card into the Bifrost. Done.

Everything Ripper just said. I'm listening to opera on a pair of Altec Model 19 clones and Bottlehead Monamour SET amps. Long time original Bifrost 2 owner. The listening space got deeper. The details are clearer. This is not a minor change. In my system, it's major and most welcome.