I have the same issue, I think. I am on a Mac. I had an Arduino Nano and it worked fine. Then I got a Nano 33 BLE yesterday and it also gives me the error: "Couldn't find a Board on the selected port. Check that you have the correct port selected. If it is correct, try pressing the board's reset b…

Can't select port on Nano 33 ble sense board

pert September 2, 2020, 6:58am 6

After you put the Nano 33 BLE in bootloader mode, do you see its port listed in the Tools > Port menu?

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