Does onkyo player show the bitrate? Flacplayer does which is how I can confirm 24/96 and 24/192 being loaded onto the player but also being played back natively via usbB port and cck.
I have the free version of Onkyo.
If you have the cash would you mind trying flacplayer app with the AK10?
example of flacplayer feature showing bitrate being played.