ZTE's MBIM stack... Broken or not?

[Markus Gothe]

Finally got the Beeline MBIM fw for ZTE MF823 working (thx to vve.su's ADB hack).

However it beats me that modemmanager does not like this device... Windows does. Windows works. But neither modemmanager nor mbim-network does cope with this MBIM stack.
Seems like the ZTE MBIM stack have issues with handling transaction IDs(!?)...

Is this a known issue? Which fw has been at hand when adding the ZTE MBIM support to MM???

//M