You can find the firmware on community-driven electronics sites like Kazmi Elecom or specialized Telegram channels Prepare the USB: Format a USB flash drive to
To download T.r85.03 software for free, follow these steps: T.r85.03 Software Download Free
Once complete, your device should move from "Other devices" to "Ports (COM & LPT)" or "Universal Serial Bus devices." You can find the firmware on community-driven electronics