The legitimate method discovered by the console modding community relies on a hardware exploit involving the Syscon and NOR chips. The Revert Method (The "Two-Slot" Trick)
You can only revert to the firmware version that was installed immediately prior to your last update. If your console is on a recent firmware and you want to jump all the way back to firmware 5.05 or 9.00, it is physically impossible unless that was your last installed update. ps4 tool downgrade v1.00
Over the years, many ideas for downgrading have been proven ineffective. It's useful to know what work: The legitimate method discovered by the console modding
Designed to infect your computer when you download and run the file. Over the years, many ideas for downgrading have
How to Revert the PS4 to a Previous Firmware (Full Tutorial)
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