Sonoff S20

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BEWARE, this device operates with HIGH VOLTAGE! To flash the case has to be opened, do not connect it to mains while flashing, it can be flashed while powered from the USB-TTL adapter. Only has 1M Flash!

To boot the sonoff into flash mode, press and hold the button while connecting it to power.

for config see here: https://ms07.de/blog/?p=315