Installing firmware 9.00 on a PS4 is a common procedure for users looking to maintain a specific, stable version for homebrew or system recovery
Your console likely won't boot normally. You must force the PS4 into Safe Mode. ps4 900 firmware download install
Always download firmware files directly from the official PlayStation website or trusted sources to avoid installing malicious software on your console. Installing firmware 9
: This file is approximately 467 MB and is used for consoles already running a lower firmware. ps4 900 firmware download install