Configure network with cellular router

Hello, we are a collective of one tens of people, we need a cellular router for the internet connection.
I have already doing in the last year, but I don't remember well.

My hardware is:
ZBT WE826-T (aliexpress)
Sierra Wireless MC7455 (aliexpress)
Sim 4G ISP: Bouygues

actually the software setup is, Rooter GoldenOrb
The modem is recognized but can anyone give us help for the configuration, for connect the internet or send AT command (only if it's required, but I don't think)

Ideally we can do it live on this thread, one evening, in a Q&A that can help anyone else in the future.
Once I have this skill I will repeat the opération for other collectives and for tens of people in some associations.

Big thanks in advance

Your post does not appear to be related to an officially released OpenWrt version, package or supported operation.

It is unlikely that you will receive useful input here.

Please seek advise from the relevant maintainer.

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Yes, ROOter support happens in

The modem scripts and applications are different from generic OpenWrt.