Hello,
I've got some problems with the connection of Arduino nano 33 Iot on my Mac.
On the Arduino IDE I selected the correct board, but on Port I can see only bluetooth-incoming-port so I can't upload any sketch. I've tried to reset the board pressing the reset button but nothing change.
Thanks in advance,
Riccardo
Please try pressing and releasing the reset button on your board quickly twice.
After doing that, do you see a port for the board under the Tools > Port menu of the Arduino IDE?
After doing that, do you see the "L" LED pulsing?
Thank you for your answer! Yes, I tried this and the "L" LED is pulsing, but no port on Arduino IDE.
OK, this proves that the ATSAMD21G18 microcontroller of the Nano 33 IoT is working just fine and that problem is in the connection between the board and the computer.
Make sure the USB cable is completely plugged into both the Arduino board and the PC.
You may have a damaged/defective or charge-only USB cable. Try a different cable.
Either of the above can result in the power connections being made (and thus LED lights on the board), but no data connections (and thus no port for the board).
Yes, thank you! I will try with other cables.
Yes, it was the cable 
Thank so much
You are welcome. I'm glad that you found the problem. Enjoy!
Hi,
I'm having the same issue but my cable worked before and other cables don't seem to change anything. L led is pulsating, but there is no COM port, both in Device Manager and Arduino IDE.
Thanks for any help in advance
T
@thomearth, test your cables with e.g. a cell phone; do they allow you to view/download e.g. photos?
If not, charge-only or defective cable.
If yes,
Does your PC have a COM1 port? If yes, select that as the port.
If you don't have a COM1, do you have an Uno/Mega/Nano or FTDI adapter? If yes, use its port, keep it connected but keep the board as Nano33 IoT.
You need a valid COM port to start the below.
Next perform an upload and double-tap the reset button when the IDE reports the memory usage.
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