Before attempting any software-based downgrade, confirm your model is compatible: All Fat Models : Generally compatible. Slim Models (2000/2100) : Generally compatible. Slim Models (2500)
Download your target firmware (such as or standard 4.88 HFW/OFW depending on your target jailbreak build). Rename the downloaded .PUP file exactly to PS3UPDAT.PUP . how to downgrade ps3 firmware 4.89 to 4.88
Install Rebug Toolbox or use the “Toggle QA” pkg. If you don’t know what this is, assume you don’t have it. Before attempting any software-based downgrade