You're looking for information on downgrading a PS4 from a newer firmware version to version 1.00 and installing a tool.
Downgrading the PS4 system itself (e.g., from v11.50 to v11.00) is significantly more complex and requires hardware modification ps4 tool downgrade v1 00 install
have released free software tools to assist with patching the chips once you have the hardware connected. Difficulty You're looking for information on downgrading a PS4
Downgrading a PlayStation 4 (PS4) to firmware version 1.00 is through simple software tools or standard installations. The "PS4 Tool Downgrade v1.00 Install" often referenced in some online circles is typically associated with misleading software or scams. The Reality of PS4 Downgrading The "PS4 Tool Downgrade v1
: You must solder wires to the NOR and syscon chips on the motherboard to dump and patch the firmware "slots".
How to Revert the PS4 to a Previous Firmware (Full Tutorial)