The short answer is that to downgrade a PS4 from firmware 9.60 to 9.00 using a simple software update or USB stick . Sony designs the PS4's security to prevent firmware downgrades as a measure against piracy and jailbreaking.
Use Facebook Marketplace, eBay, or /r/PS4Homebrew. Search for listings that explicitly say: how to downgrade ps4 9.60 to 9.00
: This process carries a high risk of bricking the console (permanently breaking it) if mistakes are made during soldering or data patching. 2. Jailbreak Alternatives for 9.60 The short answer is that to downgrade a PS4 from firmware 9