Theketchupman has released Recovery LE for 3.71 M33 v2, a VSH plug-in that should allow users to modify multiple options on their PSP including the CPU Speed, and even its registry.

Aside from the fact that this homebrew supports the 3.71 M33 v2 firmware, it has a variety of functions that users will appreciate like the unit saving the brightness settings when shut off. Another novel feature is the addition of an autodetect feature which can establish if it's installed on a PSP Slim or a PSP fat (with or without kernel 1.5). If kernel 1.5 is detected by this option, the application should allow you to change the kernel from 1.5 to 3.71 and back without having to reboot the handheld. Here are the rest of the changes as copy pasted from the developer's change log:

* (Fat only) Pandora menu added under Extends (allow you to convert your battery to Normal / autoboot / pandora)
* Warning : DO NOT USE SLIM BATTERY (that's why the Pandora Menu will only shows up on a Fat PSP)
* Recovery config change
* Bug fix : CPU speed on screen wasn't good; it should be correct
* (PSP Slim) since Dark_AleX's 3.71 M33 v2, DA has added charge via USB, so you can Enable/Disable it under Menu Advanced. However, it is not On the fly, so you need to reboot so the change can be set.

There is no Read Me file included with the application, so be very careful when using this homebrew. If you do plan on using this software be sure to delete the config.se and pConf.dat before using it to avoid locking up your system.