Adafruit ESP32-S3 Manual page 253

Erase the Contents
This will erase everything on your board! If you have access, and wish to keep
any code, now is the time to ensure you've backed up everything.
Do not disconnect after erasing! Immediately continue on to the next step!
©Adafruit Industries
Once you have successfully connected,
the command toolbar will appear.
To erase the contents, click the Erase
button. You will be prompted whether you
want to continue. Click OK to continue or if
you changed your mind, just click cancel.
You'll see "Erasing flash memory. Please
wait..." This will eventually be followed by
"Finished." and the amount of time it took
to erase.
Do not disconnect! Immediately continue
on to programming the ESP32-S2/S3.
Page 253 of 263