I can report firmware update to 3.16 was straightforward and without problems using the StarTech null modem cable checking there was just one cross-over.
My end-point is MS600 with its digital audio output set to Direct. First MQA decoding is done by Roon with the MS600 device setup set to Renderer Only.
I play an MQA source and the DSP5200SE speakers display SLS 65, but if I cycle through Display on the MSR+ the master speaker displays OFs 96k. A good sign!
The slave speaker still displays SLS 65. Is this right, or should both speaker's display the same OFs? I re-typed but it's still the same. Any thoughts?
Best wishes all