Navigate to the "Memory Manager" within the toolset via the PS3 internet browser.
Follow the prompts to patch your NOR/NAND Flash memory. This "tricks" the console into accepting firmware that isn't digitally signed by Sony for that specific version. Step 3: Installing 4.88 Custom Firmware (CFW) how to downgrade ps3 firmware 4.89 to 4.88
Put your PS3 into (hold the power button until you hear two quick beeps). Select System Update and follow the prompts. Step 4: Reverting to 4.88 Official Firmware (Optional) Navigate to the "Memory Manager" within the toolset
Do you know the or date code of your PS3 to confirm if it supports this process? Step 3: Installing 4
Since the official BGToolz site often fluctuates, find a reliable 4.89-compatible mirror.
These are generally compatible with downgrading and CFW.
Place the PS3UPDAT.PUP file on a FAT32 formatted USB drive in the folder path: USB -> PS3 -> UPDATE .