You must have custom firmware (CFW) like Evilnat or HEN (Homebrew ENabler) installed.
You cannot simply drop the folder and play. You must refresh the database. ps3 jb folder games download extra quality
A "JB folder" (or folder-type) game is essentially a decrypted copy of a retail disc, organized into a specific directory structure rather than a single compressed file. These games typically contain a PS3_GAME folder, which includes all critical game data, system updates, and the EBOOT.BIN executable. You must have custom firmware (CFW) like Evilnat