Tasmota has a firmware upgrade option somewhere in it’s web interface (I haven’t used it for ages). Upload the official .bin file using that web interface and you should be back to factory default.
Home Assistant Energy Monitoring with Shelly EM - fuse-box install
Shelly EM Power Logging with Home Assistant
Shelly EM Power Logging with Home Assistant
Home Energy Management in 2021.8 - Configuration - Home Assistant Community
Energy Monitoring with Shelly EM and Home Assistant - James Ridgway
Configuring Shelly EM Energy Meter - #42 by tom_l - Configuration - Home Assistant Community
Home Energy Management in 2021.8 - Configuration - Home Assistant Community
Energy monitoring with Shelly EM and Home Assistant
Home Assistant Energy Monitoring with Shelly EM - fuse-box install
Shelly 3EM 3-phases Energy sensor - Configuration - Home Assistant Community
Energy Monitoring with Shelly EM and Home Assistant - James Ridgway
Configuring Shelly EM Energy Meter - Configuration - Home Assistant Community
Configuring Shelly EM Energy Meter - #159 by skeefy1 - Configuration - Home Assistant Community
Energy Monitoring with Shelly EM and Home Assistant - James Ridgway