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Solution: Unload and reload the option module:

sudo modprobe -r option
sudo modprobe option
echo "0e8d 1808" | sudo tee /sys/bus/usb-serial/drivers/option1/new_id

Installing the RDA USB driver for Gallite 8809 can be tricky because Windows Update does not serve these drivers. Follow this precise method. rda usb driver for gallite 8809

For Linux users (Ubuntu/Debian), the Gallite 8809 is often recognized without proprietary drivers using the CDC ACM driver. Solution: Unload and reload the option module: sudo

To set up on Linux:

sudo modprobe cdc_acm
echo 'SUBSYSTEM=="usb", ATTRidVendor=="1782", ATTRidProduct=="8809", MODE="0666"' | sudo tee /etc/udev/rules.d/51-rda.rules
sudo udevadm control --reload-rules
sudo udevadm trigger

Then use screen /dev/ttyACM0 for serial access. Installing the RDA USB driver for Gallite 8809

macOS requires HoRNDIS or libusb, but native support is poor. Most professionals use a Windows VM with USB passthrough.