Easy way to upgrade the PSP firmware
If you run custom firmware on your PSP, it can be a little bit frustrating keeping up to date with the latest offerings from the like of Dark Alex. I found google searches on the topic usually turned up old or useless topics even with fairly specific searches. A friend of mine suggested a series of videos on youtube by a user called angelmikey511. He has a nice range of tutorials taking you through step by step how to accomplish the upgrade process regardless of the custom firmware you are running, be it a OE (Open Edition like 3.40 OE-A) or M33 team (like 3.51 M33-2).
He presently has 44 videos covering a range of PSP (and nonPSP) topics from Pandora’s Battery installation/use as well as software (like IR Shell, Brilliant Themes or Ultimate PSP 1.6) installation and software downgrade methods.