Homebrew developer Dark_AleX has released an updated version of PSPStates, a savestate plugin for PSP. This release adds support for the recently released 5.00 M33 custom firmware.
Keep in mind that due to extra RAM usage, the plugin can be used only on Slim units. Additionally, savestates created back on 4.01 firmware are not cross-compatible on 5.00, so make certain to delete them prior to installing PSPStates.
Download PSPStates 5.00
PSPStates 2 experiment for 5.00 M33 [Dark_AleX]