This guide is for educational purposes only. Downgrading firmware requires specific hardware compatibility and often voids your warranty. Sony does not support downgrading official firmware. Proceeding incorrectly can permanently brick (destroy) your console. Proceed at your own risk.
How to Downgrade PS3 Firmware 4.89 to 4.88: A Complete Guide how to downgrade ps3 firmware 4.89 to 4.88
If you are currently on 4.89 but have the enabled from a previous CFW installation, you can downgrade via recovery menu. However, if you are on OFW 4.89, the QA flag is irrelevant. This method only applies if you came from 4.88 CFW and updated to 4.89 OFW by mistake while the QA flag was still active. Disclaimer: This guide is for educational purposes only
The information provided in this guide is for educational purposes only. The author and the website are not responsible for any damage or consequences resulting from the downgrade process. Proceed at your own risk. However, if you are on OFW 4
If you own a Super Slim or a later Slim model (CECH-30xx or 25xx with specific date codes), stop here . Downgrading is impossible without swapping the motherboard. This guide applies to FAT models and early Slim models (CECH-20xx, 21xx, and select 25xx).
: Acknowledge that downgrading your PS3's firmware can potentially render it inoperable (bricked). Make sure you have a valid reason and are comfortable with the risks.