What modems are supported for the Gl iNet x750 **EDIT**

Can I upgrade from the quectel ec25-af a cat 4 to something like the telit lm960a18 a cat 18 modem I happen to have laying around? Both are mini PCIe modems?

Thanks

Edit
Ok so I have learned that the x750 is limited to only certain modems and cat 6 is the highest class modem it can support. So my new question… Is there any GL iNet router that supports a Cat 18 PCIe modem?

My goal is to flash AT commands to the CAT 18 modem.

Perhaps the M2 5G Development Board is what I need?