Hello,
before giving up definitely with this story... I would as to the forum members a suggested USB LTE stick that WORKS WELL.

Unfortunately I tried a Huawei 3372 \ k5160 and it is nightmare even if it is mentioned in the compatible HW list.

Thanks

Huawei e3372\k5160 is still updating some features so you will encounter errors when using it

What do you mean with that? Who is updating what?