When you want to flash your Shelly 2.5 with anything but the original firmware for the first time, you
Shelly 2.5
Question about the Shelly 2.5 GPIO connector · Issue #5652 · arendst/Tasmota · GitHub
Support 4 kinds of TTL levels:This is a versatile USB to TTL converter. It is powerful enough to handle almost all TTL level communications. It is
SH-U09C5 USB to TTL UART Converter Cable with FTDI Chip Support 5V 3.3V 2.5V 1.8V TTL
Shelly 2.5 - Tasmota
How to flash Shelly 2.5 with Tasmota firmware
RevK®'s ramblings: To USB or not to USB, that is the question!
Building a Shelly 2.5 USB to TTL adapter cable
Ideal for programmers, hardware engineers and DIY enthusiasts. After installing the driver, this FTDI TTL adapter simulates a COM port on your
DSD TECH USB zu TTL Seriell Adapter Konverter mit FTDI FT232RL Chip Kompatibel mit Windows 10, 8, 7 und Mac OS X
Shelly 2.5 Single Pole Installation - US Install
How to flash Shelly 2.5 with Tasmota firmware