The commonly circulated V1.5.0.8 loader is a native Windows executable. While it could potentially run on other operating systems using compatibility layers like Wine, it is not officially supported and is known to work reliably only on Windows. The Linux kernel driver for the SP7021's IOP is naturally for Linux systems.
Download the precise firmware matching your board's hardware ID. Final Best Practices sunplus loader
Run the Sunplus Loader application. Select the matching COM port inside the interface setup. The commonly circulated V1