[Garrrrrr]

stuff like this makes me wish Firefox supported serial communication like Chrome does :/. I haven't run into this since I don't have a hardware passkey, but the Circuit Python website makes it super easy to communicate and flash over serial... expect I have to use Chrome for five minutes

[drdaeman]

For DIY interaction with USB Webauthn/Passkey hardware tokens, you don't want serial (USB CDC), you want USB HID protocol. Those are two different things.

This was briefly possible with WebUSB, but all mainstream browser vendors have a stoplist of certain USB devices for security reasons.