This machine is quite mysterious; I can't find any supporting documentation or firmware, but Douyin has a version customized by "Dong Ge." However, it's only available for purchase from him.
Thanks, OM. I'm looking for a voice recording software that can be used as a DMR receiver/recorder. However, its interference resistance is too poor; it immediately cuts out when receiving U-band transmissions. At this price point, it's really just a toy.