Another CFW for the PSP is around, this one claims to be “most compatible Aftermarket Custom Firmware”. Please be aware that modifying your Firmware might brick your PSP and will break you warranty!

Features:

Dump UMD Images to ISO
Dump PSN-Bought Titles to ISO (using NPDecryptor)
UMD-4-Homebrew Support (Thanks to ardi)
CFW Folder Hider (fixes DJ Max Portable 3 and possibly other titles)
Dump PSN-Classic Decryption Keys
version.txt FW-Revision Fake Support
Supports new firmware Titles
PSN Support
ISO / CSO Playback Support
PSN Classic Sharing Support (Decryption Keydump required)
Custom PSX EBOOT Playback Support
Permanent Bootloader Support (on 6.20 version)
Recovery Menu Support
XMB Satellite Support
Overclocking Support (including WLAN fix)
High Memory Unlock Support (for 2g+ models, including 5g pause game fix)
Plugin Support
NID Resolving Support (1.XX, 3.XX, 5.XX, 6.XX)
Homebrew Playback Support
Multiple ISO Drivers (M33, Inferno, NP9660)
Registry Hack Support (Unlock WMA, Unlock Flash Player, X/O Button Swap)
PRO NoDRM Engine (use decrypted DLCs for your games)
5g IoPath Fixer (to improve compatiblity to old plugins on PSP Go)
Region Fake Support
MAC Address Hider
Gameboot Skip Support
Bootlogo Skip Support
USB FlashProtect Support
EBOOT Picture Hider (decreases loading time of EBOOT thumbnails)
5g Savestate Anti-Delete Feature (prevents savegame deletion on game resume on PSP Go)
USB Battery Charging Support (for 2g+ models)
Custom HTML Viewer Save Locations (/ISO)
Extended KUBridge for Developers (Kernel Range Peek / Poke Support)

Changes compared to PRO-B5:

[!]Fixed NODRM Engine on Dissidia Duodecim
[!]Fixed High Capacity Bug
[!]Fixed Bug in np9660
[!]Fixed button-input related startup freeze
[!]Fixed rare crash in exploiting stage
[+]Added 6.39 Kernel Support

http://wololo.net/talk/viewtopic.php?f=26&t=5152