[DG] AP Type 100/300

Hello, I am having trouble with the AP. I have switched from a laptop to a ipad and using a Brookhouse iMux st. The St-6000+ says “No Data”. Someone suggested that I need a firmware update?? I looked on the forum and because the AP is 20+ years old there are no updates available. If that is true what othe AP could I replace the AP Type 100 with?
Thanks.