Two ways:
If the Decaf board has a LCD, the power-up screen shows the firmware version, 7.0 (November, 2019).
and for all Decaf boards, run the USBView utility downloadable from the Support Pages. Select the USB Input Device that's equates to your Decaf board.
In the Device Descriptor section, the reported Device ID is the firmware version. e.g. 0x0700 == v7.00
Getting the Decaf / IOC firmware version
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