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Dark_AleX has released an update to the fatmsmod patch today. Apparently it stopped working in 5.00 due to a Sony file changing its name.

Download: [Register or Login to view links] / [Register or Login to view links] [Mirror]

From the ReadMe File:

Instructions: decrypt 3.71 using psardumper (square option).
Copy the file fatmsmod.prx in the root of memory stick.

Copy FATMS371 to /PSP/GAME or /PSP/GAME5XX.

Run the program and done. More PlayStation 3 News...