Corrupt Save Data on PSP

i had a problem on my psp. i was starting to open persona 3 portable as i load the data, it says its corrupted. i haven't done anything wrong on the save data but as i check on the Save utility, it says that its fine.is there any program or some homebrew software to fix it?

Did you updated your firmware?State along with your PSP information.

im using gen 5.50 Prometheus 4

and before that, did you update your firmware?This problem may happen on some games if you update to higher firmware(in your case, prometheus), the only way to fix it is to revert back to your previous firmware.

so it can be any firmware to switch like D2 or D3?

Yeah, or if you want to keep with Prometheus, try -3 or -2.Or just switch back to your previous firmware.

i tried switching back to d3 but still nothing change.