Downgrading a PS4 from system software version is impossible for 99.9% of users . The console's security infrastructure, including efuses and hardware-based keys, is specifically designed to prevent this. The only known method is an extremely advanced hardware modification that requires prior console-specific backups made while on version 9.00 and intricate micro-soldering skills.
Tools like BwE PS4 Syscon Patcher. Step-by-Step Overview
Flash the newly patched files back onto the chips. ps4 downgrade 1302 to 900
To understand how to revert from 13.02 to 9.00, you must understand the PS4's safety mechanism:
A computer with specialized software (e.g., PS4 Syscon Tools). Downgrading a PS4 from system software version is
Once you downgrade, you cannot update to a version that did not exist before your specific NAND flash without potentially having to redo the process.
The console was telling me: "I see you are trying to install 9.00, but I have tasted 13.02. I will not go back. I am better than this." Tools like BwE PS4 Syscon Patcher
: This is not a simple USB update. It requires a "hardmod" involving soldering to the motherboard to read and modify the Syscon and NOR chips.