Does anyone trying out Yosemite have any input on the self-starting HiLink 4G modems from Huawei? I have in some roundabout way gotten it to start but I'm not sure what part of the chain that's broken with Yosemite that works in Mavericks. My modem is a Huawei E3272 (might be exclusive to the operator Three/3 in Europe). The process is usually: connect to usb-slot, wait for the modem to mount and start the service on the on-board flash drive, register itself as a network interface and connect automatically. With Yosemite it mounts, then nothing. This is what I tried - dumb luck - that actually worked (not sure whether the kext part is needed, but that should contain the actual driver...?): 1) Copy the app package "HiLink" to a place of your choice and show its contents. 2) Show the contents of the package "mbbserviceSetup.pkg" in there. 3) I assumed these two files were interesting: "Archive.pax.gz" (have contained Huawei drivers for manual install for modems I've used) and "AppleUSBCDCECMData.kext" 4) Install the kext (someone who actually knows - not me- might want to chime in whether this is the correct procedure or not): copy the kext into "/System/Library/Extensions/" then follow the instructions here (the manual part further down on that page): http://www.macbreaker.com/2012/01/how-to-manually-install-kexts.html 5) Unzip "Archive.pax.gz" 6) Find the file "mbbservice" then run it form the terminal (cd to the actual folder it's in first): "sudo ./mbbservice" You'll have to manually start "mbbservice" each time you re-connect. Again, I don't know what part of the auto-connect chain is broken in Yosemite but the above seems to work. Maybe someone who is better informed than me can come up with a different way. EDIT: Now all of a sudden it connects automatically when re-connected to the usb-slot. Don't know if it's a consequence of the above but at least things seem to work.