Get the updates from http://www.dark-alex.org/
- Update to 3.52 M33, then 3.52 M33-4.
- Then choose if you want either 3.71 M33, 3.80 M33 or 3.90 M33
- Finally, update to the most recent version of the one you chose (3.71 M33-4, 3.80 M33-5 or 3.90M33-3).
You do not need to install all the updates in between, just the 'release', and the latest update for it for each firmware version.
The readme files included with the download explains how to update, its very easy.
If it's a fat psp then install the appropriate 1.50 addon for that firmware once you have updated it to the most recent revision.
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