Sierra-Wireless-Prime-LTE-WWAN-card-EM-series-for-mac-
I have modified kext based on the cellphonehelper kext in macOS, I have posted it on my GitHub, maybe it can help you.
Hello,
Using the kext named Legacy_Sierra_QMI.kext, the device info can be shown in WWAN. However, in the system preference, there is no em7455.
Has anyone had an idea?