rb750up

Afternoon

I am using a rb750up, with the following modems

HW-USB-E303
HW-USB-E3131
HW-USB-E3276
HW-USB-E355

But not 1 of them want to work, and I know these problem is going on for a long time now!!

Any suggestions, or links on how to config?

Thanks

You forgot to tell us what version of RouterOS you are using.