nfsu2 xbox bug HELP!

[infidel]

Hi,

I am playing nfsu2 on my xbox for some time now.
About 50% finished in the career mode.

But now somehow when i wasn't watching the road, i drove (with nitro) straight trough the red baricade that lead to an unexplored part of town.
Fun and all that i could get there without unlocking it first.
But i cant get back through the blocade again... when i restart the game i end up in that part of town, when i goto garage (thought the start menu) and go back i end up there again.. even when i get a new car from my garage i end up in the freakin unexplored part of town. And Loading doesn't work either, cus the game's autoload also drops me in the unexplored part of town. GRRR!
I cant do any races there, cant goto any shops.. so i am f#cked i guess?

Does anyone have a no-clipping cheat for nfsu2 on xbox?
Or did anyone had the same problem and knows what to do?

thanks,
infidel