QMI via MBIM for "FCC Authentication" fix

Emil Ljungdahl emil at kratern.se
Tue Apr 5 22:12:20 UTC 2016

On 04/05/16 14:22, Bjørn Mork wrote:
> Great! We definitely need this ASAP for EM7455 support in Lenovo
> laptops.  There was another request on the MM list just now.
> But I am still wondering about one thing: How does Windows do this "FCC
> auth" thingy? Do they use the magic QMI inside MBIM too, or is there
> something similar implemented in MBIM?
> Are you somehow able to do a USB snoop of the Windows driver attaching
> to the modem? I don't know how to do that with an internally connected
> device, though...  Maybe disabling/enabling the modem using some
> "rfkill" switch will do?  Or maybe it's possible to run the snooper on
> boot?
> I still recommend USBPcap for Windows USB snooping in case you want to
> give it a try: http://desowin.org/usbpcap/
> Bjørn

Well, *hrmm*, given Lenovos track record with superfish etc, I threw the
pre-installed Windows out first thing I did :)
I'm really not an expert on this USB stuff, but I have tried to connect
the modem to a Windows installation in Virtualbox, but the Lenovo
drivers seems to expect an interface with InterfaceNumber 03, while the
modem reports interface numbers 12 and 13...


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