I would suggest to go with an UP Squared with AI Core which you can use for the detection.
You also have plenty of digital I/O to use.
This is the board: https://up-board.org/upsquared/specifications/
This is the AI accelerator: https://up-board.org/ai-edge/ai-core/
And you can buy from the UP-shop:
Soon the AI Core X will also be available, which embeds the new generation Myriad X VPU.
Yes that version is fine to update with latest BIOS.
The only official supported BIOS update tool is the one provided with the BIOS binary.
From our side we never tested the Linux/Ubuntu tools for BIOS flashing.