FCC Authentication with umbim

[Fabian Schörghofer]

> Now I have been fiddling a bit with the files to try to understand the
> format, and had some success with creating similar files.  But there is
> a lot I don't know, so any experiment has a significant chance of
> bricking the modem.  Personally I don't think it's worth the risk for a
> modem you are not prepared to replace...

My method would be more like using the official NVU file from the
source.sierrawireless site, they claim that the Windows EXE will update
the firmware and the PRI (carrier provisioning file), but Lenovo does
not seem to be the "Carrier" here.

> Implementing this in umbim is on my TODO list.  Which means that I might
> do it in a couple of years :)
> 
> I don't think it makes sense to add the full QMI proxying thing in
> umbim, since there is no matching libqmi library.  A simpler approach,
> just implementing the necessary QMI messages inside umbim, is probably
> fine.  Should not be too much work if anyone wants to get their feet
> wet. I think it would be good for umbim if it got more developer action
> than an occasional patch from John or me..  Especially since I don't use
> umbim myself, except for testing.

Might be easier then to use QMI and implement the FCC method there?
(Which leads to another problem, as the EM7455 does not seem to respond
to QMI commands with uqmi, in QMI mode, but that's kina off topic here)