thx for the excellent support!. Flashed die L Rom (i dont need the android, but wand dualboot) and got a booltloader udate.
Unfortunately the next error appeared.
Code
*** Error in mount_storage: mount_common: could not mount /dev/sda ***
### starting debugging shell... type exit to quit ###
sh: can't access tty. job control turned off.
#
At the weekend i will do further tests...
Maybe i should forget about dualboot and flash it to internal.