How do I get the BrainPad working with Brainpad Arcade?

In https://arcade.makecode.com/ I can change the board to an F401 or STM32F401 and then drop the downloaded code onto the BrainPad drive, but nothing happens. I also cannot seem to be able to pair.
Is this not possible? I read the documentation on adding hardware, but this is a bit complicated: Creating your own Arcade hardware
Has anyone managed to get their BrainPad working on MakeCode Arcade?
I figure that I can hack the headers somehow to add extra buttons. Has anyone tried this?

This is what you can do BrainPad Animation & Game Extension Part 1

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