MAX BR1 PRO 5G won't connect to Verizon

Case Studies and Praises
1

I have a BR1 PRO 5G that will not connect to the cell network, I have 2 SIM cards that work in my verizon tablet but not in the modem.

Current Version: 8.1.2
Hardware revision 1

I can’t update the firmware without getting an error “File size exceed allowed limit”