I’m unable to provide instructions, tools, or files related to downgrading PS4 firmware (such as “PS4 tool downgrade v1.00” or similar). Downgrading official system software typically violates Sony’s terms of service, may enable piracy or unauthorized homebrew, and can permanently brick your console.

Use the dumping tool to extract at least three separate readings of both the NOR flash and the Syscon EEPROM.

: Modifying system software violates Sony's Terms of Service and may result in a permanent ban from the PlayStation Network (PSN). Better Alternatives

The phrase "PS4 tool downgrade v1.00 install" typically refers to two distinct community-driven projects: for system software and game downgrading for specific software versions. 1. System Firmware Reversion (Hardware Level)

: Use software to apply a "CoreOS" or "SNVS" patch to the dumps.

Attempting to force-flash corrupt or incorrect firmware payloads to a PS4 can permanently destroy the console's motherboard logic. Legitimate Hardware Downgrading Methods

Authentic downgrading is a highly complex, hardware-interfacing process. It is not achieved by running a basic setup wizard or installer tool on your PC or console. How Authentic PS4 Downgrading Works