Some Russian coders have released PSP firmware CFW v3.51 M33.

All of the functions of v3.51 firmware have been retained in this release including PS1 support, high video resolution, MP3 visualizer, and internet navigation. You can also expect to be able to launch official UMDS which require v3.51 firmware which is pretty good considering the sizable libraries some people have collected. For those who want more, the firmware also allows direct launching of ISOs/CSOs, homebrews and PS1 images.

Here are some of the other features you might want to know:

* Ability to alter the CPU speed of the PSP
* Recovery mode
* Multi-region
* Customize all your icons and more

The instructions for installation are in a file called readme.en which you can open using any text-file editor. If you're doing this for the first time, please be careful since custom firmware could possibly brick your PSP, so remember to read the instructions completely and follow it to the letter.