I have a Dell E7450, I have attached the sys profile below. I have been trying to get my DW5808e WWAN card to work. It works fine under CENTOS 7, and I have changed the USBCOMP to 6, I have tried 8 and 14 as well. All work under centos, but cannot seem to get it working under Mojave.
I have installed the Legacy_QMI as posted by Herve in another thread. I have read every thread I can find; however, there appears to be some conflicting information related to Legacy_sierrra_qmi.kext and CellPhoneHelper.kext and the need to have one or both or if either of them are required. I have tried almost every configuration I can find and cannot get the device recognized. There is not /dev/tty device, I see the device under USB in System Report. I do not see the device in the WWAN section.
I am sure I am missing something, but for the life of me I cannot seem to find it.