My pleasure. If there's no mention of MTCD/E/H on the about screen, it's not MTCD. Based on information you've provided it is not MTCD.Thank you so much for all that information. The system info states its MCU1: 1.5 (AC8259).
It is understandable that you came looking for help with ZLink but this forum is designated for MTCD units. I imagine there probably are others in the Android Head units forums that have the same head unit as yours and maybe are seeing similar issues.