New HA install add Shelly devices

I’m just started trying out Home Assistant on a new dedicated Rasberry Pi 4. After the install the detection process seems to have found only 1 of my 4 Shelly devices. I managed to configure the detected Shelly 2.5 but I am unable to add my 3 Shelly 1 devices? When I click “Add Integration” and specify the host IP it always results in a “Failed to connect”? What am I doing wrong?

The firmware on the undetected Shellys is: 20210323-104500/v1.10.1-gf276b51