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On the memor 32 save game manager, there's an option to delete everyting on the card. After you do this, the card is completely wiped and "deformatted" , and when you put it in the ps2, it tells you that the memory card is not formatted, would you like to format it now. Good as new!!
Originally Posted by JNABK
So it's pretty easy if it's messed up, you can recover it fairly easy, I just remember i had problems installing fmcb on a scph 30003 PAL, so I just wiped the memento firmware clean via the savegame manager, and reformatted the memor 32 in what was an unmodded ps2, put a later version of memento on it, and it worked.