Since more than a year I didn't do anything on my n900 besides updates.
One of the last updates broke my mobile (I think it had to do with changed partitions).
While it were unable to boot I backupped my files and installed a full, fresh firmware installation.
After this I want to install the updates and CSSU of course.

And now to my problem:
While there are so many updates at once it always broke after the update again.
By now I suppose that it is space related.

Is there anywhere a howto, how to fast install a fresh n900 in a meaningful way?

Or is it:

1. activate the other repositories
2. install pyoptify
3. then try the updates

I broke it a few times now by simply trying to update and thought it would be okay if I doing the meaningful things on the "free up rootfs space"-page in the wiki and simply install the cssu at first, while pyoptify comes as a depency of it.

It is a really strange problem. It even changes when the mobile stopps working: somethings while updating, sometimes the reboot after updating.

Edit:
I have another way how not to do this:
So this is still a fresh installation and

1. I installed the root-package and vim
2. opened terminal
3. searched for the packages with optify in their name (there were 3)
4. installed maemo-optify-runonce and pymaemo-optify them (maemo-optify wasn't installable due to a missing dependency to dpkg-dev if I remember correctly)
5. reboot

There is a font problem since then and no app can be started (see attached images).

Edit2:
Again I flashed the device. I repeated every step again besides the installation of maemo-optify-runonce. Rebooting was possible then so the font problem comes from maemo-optify-runonce. Do not install it (at least the version in the stable repositories - perhaps a newer versions better)! My problem is still how to move on while there is obviously no simple upgrade procedure anymore!?

Edit3:
I managed to upgraded from the standard repositories. rootfs has now 3 MB free space. I am afraid to reboot or install more.
Any suggestions?