Polsat Digital Decoder Abroad, IP Change, HBO GO, LTE Network, Main & Additional Router

Hello. I am a layman in these matters, so I am asking for help.

I mean connecting a digital decoder to the internet, but the problem is that I am abroad.

Is it possible to change the IP so that the decoder will work so that I can watch programs or other materials over the internet and deceive the system so that he would think that I am in the country without buying a VPN?

Added after 32 [minutes]:

I will add one more. in homes I have a main router connected to the LTE network and an additional router as a network extension.

uuu ... and you grieved me. with these VPNami it will work as it should, that is, all the content to be grasped, or can I partially display that something is not available?

I also have, but unfortunately I do not have time to watch because times do not fit me, so I would like to see something from hbo go.