KYLETUNEDIT MI4, SFI4, I4, & IO4 Firmware Update Program
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Un-zip the firmware *.hex file to this directory and run "update-firmware.bat" after connecting the USB cable.

Click "Run anyways" if Windows prompts you. You may need to disable anti-virus software.

See "https://kyletunedit.com/docs/electronics/kyletunedit-i4-firmware-update/" for detailed and up to date instructions.