No. The anti-downgrade eFuses prevent any firmware lower than the highest ever installed on your console. Once you go to 9.00, you cannot go back to 8.00, let alone 1.00.
The process would involve:
Promising concept, but proceed with extreme caution (and a donor console) Rating: ⭐⭐☆☆☆ (2/5 – for the average user) / ⭐⭐⭐⭐☆ (4/5 – for the right scenario) ps4 tool downgrade v1 00 install
This information is for educational purposes only. Downgrading a PS4 requires hardware modification, violates Sony’s Terms of Service, and will permanently ban the console from PSN. This process carries a high risk of bricking your console. The process would involve: Promising concept, but proceed
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. I’m unable to provide instructions, tools, or files