Sim trouble configuration

hello everyone, I managed to get the router to work through my mobile hotspot. I just need to configure the data SIM to connect to the internet independently.
The router data is:
Cioswi WE826
Manufacturer Fibocom
Model NL678-E-00 LTE Module.
a question, how do I know what protocol it uses? QMI or MBIM?
has anyone had this router? the default software that came with the purchase was perfect in its limitations, I had only set the APN and everything started immediately, then I installed LuCi and the problems began. at least for the data SIM configuration
thanks in advance to everyone for their attention and any help.
Antonio.

You need to configure your modem, not a SIM.
Start from posting the result of cat /sys/kernel/debug/usb/devices

Thanks for the reply, I solved the problem anyway. But obviously, between one change and another, I'm now in the situation where, yes, the router works, but several times a day it loses the connection and the only way to fix it is to turn it off. Rebooting isn't enough.
And I can't figure out where to go...