That was a super vague response by WiiM. "Made for the WiiM OS." Like I said in an early comment, sounds like a firmware difference, enabling all the WiiM features like advanced eq, room correction, etc. The fact that AudioPro support is unaware of any different "version" only leads me to continue this belief.Comment #10 suggests there are hardware differences too
I remain unconvinced and I'd like to know more because I shamelessly would like to convert my vanilla A10s to the WiiM firmware if possible, just to keep my whole fleet of devices aligned. I recognize that this likely can't or won't happen, and no drama if that's how it ultimately plays out, but until somebody explains why, I'm going to keep investigating it as a possibility.