EM7430 shows 'No Service' and cannot install updates. Requesting assistance.

then you need to apply this module to a Dell PC

you can also try if this driver can help:
https://source.sierrawireless.com/resources/airprime/software/airprime-em_mc-series-windows-drivers-qmi-build-5087/#sthash.h5BpNu7L.dpbs

you can also see if this thread helps: