Yay I got i booting through the flasher.
As freemangordon pointed out that zImage is needed for booting through the flasher and Wizzup gave the hint to read out the zImage from an uImage I got it running.
So take the uImage from the smaller partition of the sd card.
convert:
Code:
tail -c+65 < uImage > zImage
boot:
Code:
flasher-3.5 -l -k zImage -b
or
Code:
0xFFFF -m kernel:zImage -l -b