Please check below link and download OpenSDA firmware there:
http://www.pemicro.com/opensda/index.cfm
Then you need to refer OpenSDA user guide section 2.1 to let OpenSDA enter into bootloader mode, then Drag/drop or copy/paste <DEBUG-APP_Pemicro_v108.SDA> file.
After that unplug the USB cable and plug it in again, your PC will find OpenSDA debugger and install related driver to make it works.
Wish it helps.
Best regards,
Ma Hui
