Adafruit ESP32-S3 Manual page 252

Connect
You should have plugged in only the ESP32-S2/S3 that you intend to flash. That way
there's no confusion in picking the proper port when it's time!
©Adafruit Industries
In the Chrome browser visit
adafruit.github.io/
Adafruit_WebSerial_ESPTool/ (). You
should see something like the image
shown.
Press the Connect button in the top right
of the web browser. You will get a pop up
asking you to select the COM or Serial
port.
Remember, you should remove all other
USB devices so only the ESP32-S2/S3
board is attached, that way there's no
confusion over multiple ports!
On some systems, such as MacOS, there
may be additional system ports that
appear in the list.
The JavaScript code will now try to
connect to the ROM bootloader. It may
timeout for a bit until it succeeds. On
success, you will see that it is Connected
and will print out a unique MAC address
identifying the board along with other
information that was detected.
https://
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