CELLULAR ROUTER ARG600 PROBLEM

Dea Experts.
I’m setting Cellular Router ARRG600 from ABB.
I faced a problem that router receives wrong network mask from SIM: 255.0.0.0. The correct network must be 255.255.255.252.
It cause Router can’t connect internet.
Anyone here know how to resolve please.
Many Thank

Hi

Could you clarify which GL.iNet device model you’re using? The device you mentioned doesn’t seem to be related to our products.