I recently purchased an X302 HiFi DAC for Volumio, the product didn’t come with any instructions. After getting in touch with the manufacturer, I thought I’d share the link here to their Wiki for Volumio setup, since the forums did not any results when I typed in many of the keywords. Hopefully it will save someone else some time I wasted fooling around with it.
Product name on Aliexpress: Geekworm X302 HiFi DAC HAT Expansion Board & USB HUB Compatible with Raspberry Pi Zero 2W / Zero W
Manual: X950 software - Geekworm Wiki
So far this DAC HAT is working great with Volumio 3. Once configured to ST400, everything worked like a charm. Motherboard has the words suptronics printed on it.