You need to follow the SL6000 specific instructions (and use the SL6000 specific images!)
In particular, from memory:
put updater.sh and updater.data on your cf card, put in zaurus (if not already there). Press reset, now turn on while holding the OK key. You will get a menu,
pick item 4, (update?). in the next menu choose CF. After a bit, the openzaurus install menu should appear.