I have a router i am trying to use on spark with data only sim

Device name:    B315s-607
IMEI:    866854020592948
IMSI :    530052180860446
My number:    Unknown
Hardware version:    WL1B310FM04
Software version:    21.300.03.00.1085
Web UI version:    17.100.09.00.03
LAN MAC address:    20:A6:80:13:2D:E5
WAN IP Address:    10.50.1.57

I always get no cell service on the unit, i have tried to upgrade(B315s-607_UPDATE_21.318.01.02.1375) but it just says update failed every time..

Any advice appreciated

Thanks

David