TeaM M33 are back in action just a few short days after the release of the PSP Slim v3.6 custom firmware. In short, this release will allow you to and decrypt ALL PSP firmwares even up to v3.71.
Originally Posted by M33 site
This is a recode of psardumper for 2.XX & 3.XX kernels.
If you are ina cfw of the fat psp, be sure to put it in GAME3XX or in GAME if you have it
configured for 3.XX kernel.
Support for 3.7X decryption has also been added.
The instructions are same as for original psardumper, except that you don't need the DATA.PSAR
in the root of memory stick, but instead the EBOOT.PBP; this is to make it more noobs-friendly
and lazy-friendly.