ok I tried this trick and it worked...now I have problems with going back to the original settings. I did it like described in this thread: I typed Name: general.useragent.override with blank value...

However when I now open the Nokia OS2008 usersite with my N800 it tells me to come back with my N800 to this website??? (it's like opening this website with your browser on your PC)

I guess I really need to delete the name "general.useragent.override" and not just replace it with an empty string, but how???