terence K
To have your board secure designed， I suggest you set all unused ISP pin as high externally, to have a pull up resistor on those pins.
If you see the demo board schematic, you would find that those ISP pins are floating. As I know some of customers' board can still work normally even those pins are floating. But we also have minority customers meet problem.
So I suggest you have all unused ISP pins set to 1 externally to guarantee the board ISP design function well.
Have a great day,
Jun Zhang
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