> Microchip's board is a demo board. It may or may not follow good
> engineering practise but generally they serve their purpose well.
> But there are some ugly application notes out there as well. In this
> paticular case, it is a bootloader. It is the user's repsonsibility to
> design the hardware/firmware to use the bootloader or modify it.

Why do you think the board does not have the pullups for the
unused pins?

> 
> 
> Regards,
> Xiaofan
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