Hi,
I just started playing with the Arduino Nano 33 BLE sense.
After one of the SW uploads, the Arduino could not be recognized anymore (not listed as a serial device).
Any advice here?
Is there a factory reset procedure of any kind?
Thanks in advance.
Solved.
Looking around at the forum, I pressed the reset button twice running the bootloader. Now my Mac detected the Arduino once again.
Also for the information 
NOTE: If the board does not enter the upload mode, please do a double press on the reset button before the upload process is initiated; the orange LED should slowly fade in and out to show that the board is waiting for the upload.