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See my post, few above this one.
You can download parameters that we can send to printer, and all explanation.
That is what you can set up. It is taken from Chinese vendor from which Anycubic ordered 32bit boards.
There is nothing for PID of the bed unfortunately.
Nobody knows what is in software really. When I posted information about who is making firmware for Anycubic printers, my comment was deleted by Anycubic from their github. :-)