Can any access point work with any firewall?

Hey all. Can you please help me out. I have sophos AP 55c access points set up and and managed through a cyberroam firewall. I want to add more access points, but the company says that it's an older model, and the newer models will not work with the existing firewall, and that I'll need to buy a newer firewall. Is this correct? I'll provide some more details when I get to work.

Thanks