Since you requested a "good report," I have structured this to cover the details of a 100% completed save file, what features it unlocks, and important usage instructions to ensure the data works correctly on your PSP or Emulator.
Even with the right file, problems can occur. Here are fixes for the most frequent issues:
If you are looking to transfer, back up, or use community-made save files, here is how to handle the data: File Location
Instead of manual save editing, many players use a cheats database (cheat.db) with PPSSPP to unlock content like infinite money or all cars.
How to Save Your Progress
Save Not Showing Up
Ensure you didn't paste the folder inside another folder. The path must be PSP/SAVEDATA/[GameID_Folder]/ containing the PARAM.SFO and data files.
Backing Up Save Data: To back up your save data, navigate to the "PSP/SAVEDATA" directory on your memory stick using a computer or the PSP's file manager. Copy the folder corresponding to your Fast and Furious game. It's advisable to rename the folder for easy identification.