Adafruit ESP32-S3 Manual page 254

Program the ESP32-S2/S3
Programming the microcontroller can be done with up to four files at different
locations, but with the board-specific factory-reset.bin file, which you should have
downloaded under Step 1 on this page, you only need to use one file.
Once completed, you can skip down to the section titled Reset the Board.
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Click on the first Choose a file.... (The tool
will only attempt to program buttons with a
file and a unique location.) Then, select the
*-factory-reset.bin file you downloaded in
Step 1 that matches your board.
Verify that the Offset box next to the file
location you used is (0x) 0.
Once you choose a file, the button text will
change to match your filename. You can
then select the Program button to begin
flashing.
A progress bar will appear and after a
minute or two, you will have written the
firmware.
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