What I suggest is get a 2nd flash drive and copy a new save to it and compare the two and figure out what you need to do. I copied the save files to a USB stick, then to the pc in a folder of its own. I used the USB stick for other stuff over the 3 or 4 weeks in between.
SaveWizard (.net) Steps: Download & Install the PS4 version of Dead Island 2. Insert USB to PS5 - Go to Settings > Save Data and Game/App Settings > Save Data (PS4) > Console Storage > Copy to USB Drive > Dead Island 2 > Copy. Insert USB to PC - Launch Save Wizard. Note: If its your first time, register your profile to SaveWizard (may not work
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