There is no official or easy "undo" button. Once a PS4 updates, the NOR and Syscon chips are patched to accept only that version or higher. Defining the "Better" PS4 Downgrade Method
This is a professional-grade toolkit for manipulating the console's Syscon chip, primarily for repair, system modification, and recovery.
To successfully "revert" or downgrade a PS4, you generally need advanced hardware skills: Hardware Modding ps4 tool downgrade v100 download better
How to Revert the PS4 to a Previous Firmware (Full Tutorial)
Many of these links force you to complete endless surveys or pay subscriptions to unlock a password for a file that does not exist. 🛠️ How PS4 Firmware Downgrading Actually Works There is no official or easy "undo" button
You must solder tiny wires directly to the microscopic points on the Syscon chip and the NOR flash memory chip.
PS4 Tool Downgrade v100 Download: Better Methods for Firmware Reversion To successfully "revert" or downgrade a PS4, you
However, before you download any files or connect a USB drive to your console, you need to understand how PS4 hardware security works and why these software-only downloads are highly dangerous. The Reality of PS4 Firmware Downgrading