so here it is
1. download the attached file.
2. extract it and do not bother reading the readme file.
3. uninstall any psfreedom(0.6 or other) from your n900.
4. plug in your USB cable, choose Mass storage mode and copy the 3 files in the zip file to the root of mass storage.
5. go to app manager and download rootsh
6. unplug USB cable
7. launch x terminal and type
sudo gainroot
cd MyDocs
sh psfreedom-enable-maemo.sh
8. plug in USB cable and connect to ps3
9. remove power cord, reconnect it and press power and immediately eject

here u r