Since the official BGToolz site often fluctuates, find a reliable 4.89-compatible mirror.
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)
You can then take an official 4.88 update file and install it over the CFW. how to downgrade ps3 firmware 4.89 to 4.88
Some work, some don’t. You must check the "Date Code."
Doing this removes your ability to run homebrew apps. ⚠️ Essential Safety Tips Since the official BGToolz site often fluctuates, find
If the power cuts during the Flash Memory Patching (Step 2), your PS3 will become a "brick" (unfixable).
Navigate to the "Memory Manager" within the toolset via the PS3 internet browser. Step 4: Reverting to 4
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.