Don't have a BDP-2 but have a Meitner MA-1. I assume the firmware update (of a few years) back was done on the Meitner to allow it to do DSF? Have you done the below on the BDP?
"If your USB DAC is capable of
DSD over PCM (DoP), check
the box next to it. Note that in
our example, the built in audio
device (ESI Juli@) is not DSD
capable, nor is the Bryston BDP-
2 connected via USB below it.
However, the Ayre USB DAC is
DSD capable, and therefore we
have checked the box next to it.
4. Click Apply to save your changes.
The BDP will remember these settings and they will be applied each time the device is restarted."