: Sony’s official Safe Mode will reject any system software installation file (PUP) lower than your current firmware version. The Hardware Mechanism: How "Reverting" Works
Attempting this downgrade carries significant risk and should not be undertaken lightly.
If you were previously on 9.00 and then updated to 10.50, 9.00 still exists in the inactive slot. ps4 downgrade 10.50 to 9.00
The PS4 stores two firmware versions on its motherboard: an (current version) and an inactive slot (the version used immediately prior to the last update).
Resolder the chips and boot the console into Safe Mode to reinstall the official 9.00 firmware. Critical Limitations : Sony’s official Safe Mode will reject any
Modern jailbreak solutions for version 9.00 boast stability rates as high as 95%, offering relatively reliable access to the console's full potential. Additionally, the PPPwn exploit - a kernel remote code execution vulnerability - works across all PS4 firmware versions from 7.50 up to 11.00, but the broader homebrew ecosystem (including GoldHEN payloads) is most mature on version 9.00.
Use software to "corrupt" the active slot data so the system is forced to fail over to the inactive (previous) slot. Writing Back: Flash the modified files back onto the chips. The PS4 stores two firmware versions on its
. It cannot be done through a simple USB software update or by formatting the hard drive, as the console's motherboard (the Syscon and NOR chips) stores the current and previous firmware versions to prevent unauthorized rollbacks. The Reality of PS4 Downgrading Hardware Requirement