Right! You MUST supply your Shelly with 12V DC (e.g. with a wall power supply) if you want to flash with an USB adapter.
Are you aware of any official place where this information is provided by shelly?
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I have noticed by using a multimeter that the L (as in "live wire", I assume) is connected to the ground pin the header on the Shelly1. If we use an usb serial adapter plugged to a computer to communicate with the ESP in the Shelly, isn't there a good chance that connecting the ground of the usb adapter to the Shelly1 would cause a short circuit and potentially burn the computer?