How To Downgrade Ps3 Firmware: 4.89 To 4.88

Some work, some don’t. You must check the "Date Code."

Plug the USB into your PS3 and attempt a System Update via Storage Media.

Always verify the MD5 hash of your firmware files to ensure they aren't corrupted before installing. how to downgrade ps3 firmware 4.89 to 4.88

These are generally compatible with downgrading and CFW.

Since you are on 4.89, you cannot simply install a 4.88 update file over it; the PS3 will block it as an "older version." You must exploit the system memory (Flash) to allow the installation of older or custom software. Some work, some don’t

Place the PS3UPDAT.PUP file on a FAT32 formatted USB drive in the folder path: USB -> PS3 -> UPDATE .

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) These are generally compatible with downgrading and CFW

If your goal was to get back to a "clean" 4.88 Official Firmware (OFW): Install the 4.88 CFW first using the steps above. Once on CFW, the system restrictions are gone.