If you have OE/M33 firmware equal or greater than 4.01 M33-2 and less than 5.00 M33 please start from Section E.
If you have OE/M33 firmware equal or greater than 5.00 M33 and less than 5.00 M33-6, please start from Section F.
Completely shut down your psp by holding down the power button or removing the battery (make sure you are NOT going into sleep mode)8.
With this firmware, everyone could update to 2.71, to get all the additional features, like the web browser, rss reader, and still can run homebrew (and pirated games).
This release permitted to run compressed games from the memory stick, in CSO format. Still 3 months later, Dark_Ale X released the 3.02 OE firmware.
Made the mistake of updating it to 6.61 apparently 6.60 is preferred if im not mistaken.
The Play Station Portable system software is the official firmware for the Play Station Portable.
If you have not downloaded the file from the "what you need step", download it and extract it using win rar.(oh yeah.....install winrar first) =P4. you will be prompted with a flash screen (recovery mode ,main menu)9. keep tapping "O" and you will be prompted with the default setup as you did when you first got your psp.12.
Press and hold down the right shoulder button while powering on the psp. When done, manually restart the psp by completely shutting down again. When powering back on, you will see a blue error screen with lots of words in different languages on it. Even just one person because then, it was worth writing.
THIS INSTRUCTABLE SHOULD REALLY BE TITLED HOW TO USE THE RECOVERY FEATURE ON CUSTOM FIRMWARE PSP'S PROPERLY (But I liked my title more) As all disclaimers say.
Back up all your data on your memory stick as you will be formatting it. Select the option that reads Run program at PSP/GAME/RECOVERY/EBOOT.
Watch this video to learn how to update your Sony PSP to firmware 3.71 m33-4.