u/Kunastsuyu

download Chromium (or a Chromium-based browser) if you don't have one, and go to https://sayodevice.com to configure it.

if you're on Linux, you'll need to allow Chromium to access your USBs through the HID proto. run these commands:

lsusb # to find the ID of your SayoDevice, usually 8089:0009
echo 'SUBSYSTEM=="hidraw", ATTRS{idVendor}=="8089", ATTRS{idProduct}=="0009", MODE="0666"' | sudo tee /etc/udev/rules.d/99-sayodevice.rules # write udev rules to allow non-root users to access the device
sudo udevadm control --reload-rules && sudo udevadm trigger # reload udev rules