Well... If you've installed the "speedpatch", you're pretty much on your own as no one would be able to guarantee a working device with that crap installed...

http://talk.maemo.org/showpost.php?p...0&postcount=17

A reflash would be your best bet. If you're lucky you can do it with a kernel-only reflash.

http://wiki.maemo.org/Updating_the_tablet_firmware