DLC Decryption

[Hykem]

I have a question regarding the encryption/decryption of SAVEDATA.
Thanks to Hykems option "Disable SAVEDATA encryption", my old savegames still work, even tough they are not encrypted. However, since encryption seems to work now, I've been trying to convert that unencrypted SAVEDATA to encyrpted savedata. So far without success.
Is there a way to use jpcsp or another program to manually encrypt/decrypt SAVEDATA?

Unfortunately, those old save games had many missing data portions, so they were never compatible with a real PSP.
You can try to disable "Disable SAVEDATA encryption" and let JPCSP auto detect the SAVEDATA as unencrypted (this is now possible, JPCSP detects if the SAVEDATA is encrypted or not). If this succeeds (it may not work, because the old PARAM.SFO files were terribly corrupted) then JPCSP will load your unencrypted SAVEDATA and the next time you save your game it will output it as encrypted.
By the way, I suggest you also take a look at the standalone program SED for PC (http://wololo.net/downloads/index.php/download/8122 ) which uses the same algorithms used by PPSSPP/JPCSP without having to use an emulator.