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Hey ! I need help. I fight with this modem for a few day, I have read some topic about this, but for me don't work with successfully. I have High Sierra 10.13.3, Dell E7240 and Sierra Wireless AirPrime (Qualcomm 4G) DW5570 (7W5P6) (VID 413C; PID 81A3) I used Legacy_Sierra_QMI.kext (so modem is active in system report - position usb and wwan). Who exactly explain me what and how I must edit. FakeSMC.kext or CellPhoneHelper.kext (or both?). Perhaps I have wrong port on USB ? Thank for any help. Greetings Mates!