What is CFW (Custom Firmware)

A CFW is a system software for psp created by the psp hacker Dark Alex which makes the psp run homebrew application. In simple words, without a CFW, you can't put your psp games on your memory card, because it won't work.
Every PSP comes with an installed custom firmware. The CFW will be installed on that psp only if the psp is downgraded to 1.50 official firmware using a pandora battery and magic memory stick. On a CFW you can really experience all the beautiful features that the psp offers. Anyway every application installed, has a specified risk of bricking the psp (or to turn the psp unusable). So it is very important to read the tutorials first, before doing anything on your psp.

Here is a list of recently CFW created by Dark Alex:

3.52 m33, -1, -2, -3, -4
3.60 m33
3.71 m33, -1, -2, -3, -4
3.80 m33, -1, -2, -3, -4, -5
3.90 m33, -1, -2, -3, -4, -5
4.01 m33, -1, -2