Problems transcoding/playing DSF(128) - WAV24;176 on OPPO Sonica DAC

[tbe2013]

Hi@all,

sitting here and playing with a friends new Oppo Sonica DAC. We are using MinimServer 0.8.5.3 update 126 on a Synology DS214play.
Normally we are transcoding all our flac files to wav24 with the following stream.transcode options flac:wav24,alac:wav24,mp3:wav24,dsf(128):wav24;176
The Sonica DAC is able to play all formats except dsf to wav24 or any other output format. DSD64 can be played natively. DSD128 cannot be played natively neither with the selected transcoding option. I also gambled around with BubblePlayer and FFMPEG transcoding and had a hit with L16 96. Directly transcoded with MinimStreamer I had no chance to get this working.
If I play native 24/176.4 KHz flac, converted to wav24, everything is fine with the DAC. Any Idea what is going wrong?
@SimonCN: Any Logs I can provide you with for debugging?
Thank you all for your assistance.

Regards
Tobias