Homebrew developer Red Squirrel has released a maintenance update to his Alternative VSHMenu plugin for PSP, which adds additional functions to the XMB configuration menu already included in M33's custom firmware series.
Version 4.2 patches up a bug that caused PSP Slim units to reboot upon closing the VSHMenu plugin.
Download Alternative VSHMenu 4.2
Red Squirrel - PSP Home Page [PSPGen]