I got now 3 other sticks, they are working:
Huawei E173
Huawei E1550
Huawei E272
these are without sim lock, maybe my old E303C has sim lock, this could also be the problem.
I got now 3 other sticks, they are working:
Huawei E173
Huawei E1550
Huawei E272
these are without sim lock, maybe my old E303C has sim lock, this could also be the problem.
Wow, 3 in one shot.
I updated the open post and made a MR for the official documentation. I hope this will help other people.
Thanks for the updated information.