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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@user156811
I'm not a expert, but my first question would be can the Pico uart driver even go that slow? I know hardware drivers have to do clock dividers to get to a certain frequency and that might be lower then the ranges it can work in.
But you could try and take a jumper from your Pico TX uart lines and connect it to your RX lines. Thus created a loop in your communication. It should be a quick test to see if the device can actually produce and receive that range. If it can't i would hook up a oscilloscope and see the timing. It might be slightly off.