If the port does not appear, hold BOOT button on the back of the board (not the knob), tap the reset button,
then connect.
Do not hold the knob while plugging in the USB cable - GPIO 0 enters download mode.
Install updates the app at offset
0x10000 and keeps Wi‑Fi and saved settings. Upload a
merged .bin only for a full factory flash at 0x0.
Erase flash wipes the entire chip (same as a blank factory
part) — use only when you want to clear everything before reflashing.