Set 7.7z
The interesting string there is at the very end, which says SN32F24x (all SONiX chips seem to start with SN). With a bit of Google-fu and creativity you can land on the product page for the SN32F248. Over there you can also find a bunch of links to utilities and manuals, one of which is called SONiX_USB_MCU_ISP_Tool_V2.3.1.7.7z. Opening the extracted firmware yields a good result:
Set 7.7z
041b061a72