Switchbot meter firmware update broke sbm2mqtt.py

I was using sbm2mqtt.py on a raspberry pi 3+ to read a switchbot temperature sensor and foolishly updated the firmware of the sensor to V2.7 and now when I run sbm2mqtt.py all I get is

Scanning for SwitchBot Meters…


What has the firmware update broken?

Did you figure this out? I have the same issue.