First of al thank you for this post.
i have followed al the steps.
the first time after rebooting the n900, it was possible to acces the multiboot screen, after that, the phone always starts up in maemo, the multiboot screen never appeared again.
any suggestions ?
9-2-2011 Flashed my N900, started with the tut from the top, everything is fine. now waiting for further updates. Thanx guys.