(unfortunately I was not allowed to write in another subforum so I had to choose this one).

I managed installing BT3 on my USB drive (120 GB).
Furthermore I succeeded in adding a second partititon to that drive in order to make persistant changes work.

After that worked I tried to upgrade the Kernel to 2.6.25.
The installation process went successfully.
But as soon as I tried to reboot my distribution it told my after the kernel got initialized that the BT3 data could not be found.

Is it worth a try to upgrade to a newer Kernel than 2.6.25?

I am sure people have dealt with that before. I couldnt find another thread though...

Do you have any idea what went wrong?