But the path was not a simple one. The PS3, by design, refuses to "go back in time" to an older firmware version if it's running a standard, non-jailbroken system. Our modder knew that to break this rule, they first had to master the machine's memory. The Quest for Compatibility
If your console is on official firmware (OFW) 4.89, you cannot simply revert to 4.88. Sony’s firmware update process is cryptographically signed and includes irreversible one-time programmable (OTP) fuses that blow with each update to prevent rollbacks. how to downgrade ps3 firmware 4.89 to 4.88
The browser stalled, the little analog clock spinning on the screen. But the path was not a simple one
If you are on 4.89, the webkit exploit is patched. You cannot install CFW directly from 4.89 without a hardware flasher. how to downgrade ps3 firmware 4.89 to 4.88