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It is highly recommended to use a USB isolator if you are programming while the high-voltage battery is connected to prevent ground loops that could damage your laptop. Instructions For Use - SiAECOSYS

Connect the USB-to-serial cable to the controller's programming port. Download Votol Software

If official links are unavailable or you need specific firmware files (like .bin or .ini packs), community forums host archived versions: It is highly recommended to use a USB