Virtuous Flame is the main man behind this new release of cfw pro, the open source Custom Firmware compatible with all PSP models.
The main feature of this new revision is the integration of popsloader directly in the CFW, which allows you to play PS1 backups from your PSP (useful if your old PS1 titles are not available on the PSN, or simply if you don’t want to pay Sony twice for the same game), but it also ships with a few other features and bug fixes. Quoting coldbird:
•[!]Vshctrl code refactored
•[!]Disabled “Pause Game” on PSPGo while ISO cache is enabled due to incompatiblity
•[!]Disable ISO cache by default on PSPGo
•[!]Fixed potential lag while displaying ISO movies
•[!]Added support for Popsloader in PRO
•[+]Added Idol Master SP Genuine Check Bypass Code
Pro CFW can be downloaded from the official project page, where you will find versions for PSPs running on 6.20, 6.35, and 6.39 (and if you have a different firmware installed on your psp, just upgrade