Howzer

I'm looking at updating the Firmware on my M51 from 1.39 to 1.50 or whatever the latest is, am interested in trying it out and also the Linux support (I could be wrong about this last part). Can someone please provide with a link to 1.39 so I can roll back if need be?

I have a NAD M51 using USB connection on a Win 7 machine. I recently purchased some HD 24/192 tracks by The Eagles and noticed that when playing these in Media Player Classic the NAD was only showing 44.1 on the screen. I then switched to XBMC using WASPI and the screen on the NAD correctly showed 192K. If I go to the control panel -> sound -> and change the properties on my NAD I am able to set the default sample rate and bit depth to 192 / 24. My question, should it be set on 192 / 24 in Windows permanently? Doing this seems to up-sample my standard content (my FLAC CD rips show up as 192 when using MPC). Is Windows doing some crude up-sampling here (I have not had a chance to do listening tests)? Any thoughts would be appreciated.