(These instructions are for updating an iomixer board that is already running an existing version of the firmware.
If you made your own board you will need to flash the bootloader first, for that see: https://youtu.be/BKhxOeRhcWc )

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1. Download the appropriate firmware file (eg. named like iomixer-0.1.4.bin). Do not use the files named 'bootloader' or 'both'.

2. With the iomixer connected to the configurator, click "Request bootloader on restart" in the 'Firmware' panel.

3. Unplug the iomixer USB cable, then plug it in again. In the 'Device' panel, check that it now shows up as 'iomixer bootloader'. The blue LED will also flash twice every few seconds.

4. Place the firmware file to be flashed in the same location as the relay server was started from, and in the 'Firmware' panel click "Refresh list".

5. Select the file to be flashed from the pull-down list and click "Flash firmware".

6. After flashing has finished, unplug the iomixer USB cable, then plug it in again. Check the new version in the 'Device' panel.
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For a video demonstration, see this YouTube video: https://youtu.be/O6NVy6e5CBQ