Well managed to fix the problem:
* Angstrom installed (deleted
* Cacko, very nice, but somehow outdated
* PdaXrom, the Uboot installation didn't let me Zaurus boot, so restored the NAND.
* Tried to install the multikernel booter again, and it worked!
* Running Zubuntu, but the mouse isn't working well, it keeps drawing selection forms, so I can't click a thing.
Any ideas?