ZTE Nubia Z7max, problem with mobile data on stock 3.77

Hi
Last weekend I've installed stock rom 3.77 on Z7max and the problem is: my modem doesn't work, and I have no mobile data connection,
I see a few possible ways:
a) update just baseband 3.77
b) go directly to LightX 3.77 (or CM12.1)
c) go 3.22 (via nubia updater), next LightX 3.77 (or CM12.1)
c) go mokee 6.0.1

any hints?

[EDIT]
No hints, but I had some time
So, option a) didn't work.
Next tried option c) - installed 3.22 and then 3.77 LightX, unfortunately I stuck in some SIM Settings app. I could not leave it, and it was crushing.

So, finally option c) worked with CM12.1
Its a little slower then 3.77 (antutu on CM is 49k and on 3.77 51k), but everything is working