cdc_ncm: Specific Huawei E3372h firmware version stuck in NTB-32

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I have two mobile broadband Huawei E3372h devices, one with firmware 21.200.07.01.26 (aka the 200-version) and one with firmware 21.318.01.00.541 (aka the 318-version). 

Whereas the 200-version works perfectly with a recent kernel (4.10), the latter never manages to exchange any IP-packets. Upon debugging USB-traces, I found that the 200-version correctly switches to NTB-16, whereas the 318-version stays in NTB-32 mode.

I am a bit lost when it comes to debugging and solving this problem any further, any guidance would be greatly appreciated.

Thank you,

Christian

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