I am using a few Shelly 1 and 2.5 to make my old fashion wall switches ‘smart’. The inputs are used in automations. After upgrading the Shelly firmware from (i think) 1.6.0 to 1.8.0, I didn’t get any switch inputs anymore. So I went back to the 1.6.0 firmware. Using an nice tool to find the old firmware: https://www.shelly-support.eu/index.php?shelly-firmware-archive/ .