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Firmware updates itself upon every device boot if necessary. Please do not interrupt the update process, even if the "UPDATING" sign will stop rotating.

Factory reset

Please press the button for about 10 seconds. All settings including wi-fi passwords will be erased and new device's UUID will be generated.

Firmware re-flash

If you need to reflash firmware in your device, use following sketch:

Or do it manualy:

$ curl >> 3DA0100.bin
$ esptool -vv -cd nodemcu -cb 115200 -cp /dev/cu.wchusbserial1420 \\
    -ca 0x00000 -cf 3DA0100.bin