For instructions on updating your iomixer firmware using the configurator, see this YouTube video: https://youtu.be/O6NVy6e5CBQ The 'both' file includes bootloader and main firmware together. Main app offset is 0x4000 Flashing examples using st-flash: Bootloader or 'both': st-flash write iomixer-bootloader-xxx.bin 0x8000000 st-flash write iomixer-both-xxx.bin 0x8000000 Main app only: st-flash write iomixer-xxx.bin 0x8004000