Naruto Shippuden Ultimate Ninja Storm 4 Save Data Does Not Exist Fixed

The "Alternate MAC Address" trick (For persistent errors).

If the game won't let you create a save, but it will load one, this is the best fix. You download a save file from a trusted source (e.g., Nexus Mods or MrAntiFun). The "Alternate MAC Address" trick (For persistent errors)

(Note: 349040 is Storm 4’s Steam App ID) but it will load one

If you see the prompt "Do you want to create new save data?" The "Alternate MAC Address" trick (For persistent errors)

If you are prompted to "Press A" but nothing happens or it says data doesn't exist, you might be using the wrong key.