PSP - PPSSPP save

[Cat Pharaoh]

So all my PSP saves are on my Playstation Classic with it's PPSSPP core. And because the PS Classic has no battery, everyday is groundhog day. I just want to get my achievements in FF Dissidia for playing for 7 days straight and 30 days overall. I could do that by leaving the system on for 30 days total with save states...

Between PPSSPP on PSC, Adrenaline on Vita, and PS3's PSP Remasters Launcher, no 2 systems have compatible saves. Each see another's as corrupted data. I'm sure the .SFO files have some corners cut in general, but it's more likely encryption vs raw data and then something else in between (seeing as there's 3 different systems that can't agree on the save format). Does anyone know which format is proper and how to do the necessary conversions? Thanks.