Updating psp m33 firmware
It uses the Xross Media Bar (XMB) as its user interface, similar to the Play Station 3 console.Updates add new functionality as well as security patches to prevent homebrew applications and plugins from being executed on the system.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.
Not only this guide describes how to get the basic custom functionality, which was already described in great detail, but also talks about how to install the 1.50 kernel patch and the Custom Firmware Extender 1.6.
(E.4) Go to Recovery mode (Power off your PSP by holding the power button for 10 seconds.
O.4) Official firmware update 5.00 Files to be downloaded and extracted: (a) Custom firmware 3.52 M33 (DL. Revert your kernel to 3.52 (or any kernel above 3.52 like 3.90). (C.5) In your PSP, browse to your Memory Stick and run the program ).
This is designed to remove custom firmware easily and restore a classic 1.5 firmware back to your psp.
Most people know of the famous pandora battery technique which will unbrick and/or downgrade a psp's firmware.
If you come across any problems with this tutorial, I suggest you visit the ur PSP forums and post your query there.