someone said it was like 98% compatibility backporting, but in reality it's more like 60-80%. some games simply don't work. I'm trying ni no kuni with 80 files to backport. couldn't get control to work with 25 or so.
Edit: I found a backport, filename says A101, it's only 60-odd meg so I'm guessing it's a fix for the base game rather than the actual 1.01 update backported. If anyone sees/makes a backported update (latest version is 1.03 afaik) please lmk, but for now I'm happily playing the game lot of fun so far.
Cause what is calling "backporting" right now consists of changing a string in ELF/PRX that indicate the minimum FW required to execute them. It works without problems when a title was developed with an SDK lower or equal to, in this case, FW 5.05 or when it doesn't use new functionalities introduced on newer FWs, otherwise it fails.
A real backport instead would consist in replicating the missing functionality on lower FWs or modifing titles' executables to not use those missing callbacks, but still behaving correctly.
I don't see people wasting time dong this king of patching, but I would not be surprised if someone step forward only to prove me wrong, I've seen crazy things done on emulators/consoles...