Electrum / Coldcard error - No hardware device detected

Im getting a "no hardware device detected" error from Electrum when connecting to Coldcard Mk3

I have tried different USB ports and different cable but still get the issue.

I downloaded, verified and installed the latest firmware to the cold card but on downloading the latest version of Electrum I a bit unsure about the verification.

When I try to verify the Electrum download an error states:

Expired signature

Signing Key:

Stephan Oeste [email protected]

637D B1E2 3370 F84A FF88 CCEO 3152 347D 07DA 627C

Signed File:

electrum-4.5.8. dmg

Can anyone advise?

thanks