Downgrading your PS4's firmware can potentially brick your console, rendering it unusable. Proceed with caution and at your own risk. I provide information, but I do not condone or encourage downgrading.
Sony uses "anti-rollback" mechanisms to prevent users from installing older firmware. The system stores the current and previous firmware versions in its hardware chips (Syscon and NOR). To "downgrade," you aren't actually installing an older version; you are ps4 downgrade 1302 to 900
You cannot software-downgrade one error into the other. The only proven method—Syscon flashing via a Teensy—requires advanced soldering skills, specific motherboard revisions, and the willingness to permanently destroy your console if you make a mistake. Downgrading your PS4's firmware can potentially brick your
If you have landed on this page, you are likely staring at a console that will not boot, a system that suddenly demands an update, or a jailbreak attempt that has gone horribly wrong. You have heard whispers on Reddit or GBAtemp that by downgrading from a specific error state (error 1302) to an older firmware (error 900), you might save your console. Sony uses "anti-rollback" mechanisms to prevent users from
: If you successfully downgrade to 9.00 (which is a popular version for jailbreaking), you will lose all access to PlayStation Network (PSN) and online gaming.