There is no useful port in mac Big sur 11.6 for arduino

Development Tools IDE 1.x
2

Please follow the advice below and see if they fix the issue:

  • Try a new USB cable making sure it is a DATA USB one and not a charging one.

  • In the case you are using a USB-A to USB-C dongle try another one(preferable offical apple); Also try flipping the dongle upside down in different orientations as this can make a difference at times.

  • Try another port on the Mac see if it has the same behaviour

  • Make sure the board is directly connected to the USB port without USB hub in between.

  • Make sure AVR core is up to date on Arduino IDE > Tools > Boards > Board Manager: search for Arduino UNO and update/install the AVR core, that is, the latest version.

  • Connect the board to a different computer and check if it has the same behaviour.

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