Hi,
I just want to give my previous experiences on MC7455 where at 1st place installed on LENOVO X220/X220T running Windows 7 Pro 64 bit. Even though I’ve installed with latest Sierra drivers, this module still not recognized and at last I could see only “QDLoader Mode” port inside windows device manager. Yes “QDLoader Mode” is equivalent to “Boot and Hold” mode which means that module waiting for firmware to be flashed. With this situation, not other Sierra tools could resolve this situation and we could resolve through Linux/Ubuntu. I’ve tried installed on Ubuntu and I could see that device inside “lsusb” and “/dev/ttyUSB2” was established. I’ve followed as steps recommended for 3rd party tools where end up with “no luck” where this module was totally not recognized on ubuntu and windows. I believe you should use Sierra SDK Tools (as recommended) instead.