Test Drive Unlimited (PSP) issue

Recently downloaded the European PSP ISO for Test Drive Unlimited from here but I'm having a strange issue with the game and not sure if the issue is this ISO or how I'm running it. It's running on a PSP 3000 (I think) with CFW, 6.61 Pro-C Infinity 2. The issue I'm getting is that when I start a new game it asks me if I want to connect online and the only option is yes, and then it asks for ad-hoc or infrastructure (which I'm guessing is the official servers, which are long since dead), both obviously fail and asks me if I want to retry. There's no way past it. I remember playing this game a long time ago with no issues as I don't remember ever having to connect online, but this was with official firmware and using the UMD, which has long since gone.