I am revisiting my earlier post dated May 30,2025 re streaming in DSD512 to Eversolo DMP A6.
I noticed, under device setup/advanced: DSD 512 may or may not show. rverything else remains unchanged. DSD256 is always available. So after a gap of few days DSD512 is again available!
Your Roon Server is not up to the task of upsampling to DSD512, which makes it a bit of a moot question. Processing speed needs to be above 1.2-1.3x at all times to secure glitch free playback.
But still, Roon discovers the capabilites of endpoints (RAAT zones) by a handshake process, it is decided by the endpoint what the max sample rate and formats might be. Have you asked Eversolo the same question?