Always verify the source. The official 9.00 PUP file has a known SHA-256 hash. If you don’t know what that means, stick to updating directly through Sony’s servers – even if that means losing access to 9.00.
Improved stability for those using the PS Remote Play app on mobile devices or PC. How to Download PS4 Update 9.00 ps4 update 9.00 firmware download
Folders must be capitalized exactly as PS4 and UPDATE . Always verify the source
If you update past 9.00 to 9.03 or higher, you cannot go back. Sony patched the exploit in later versions. ps4 update 9.00 firmware download
Remember: Modifying your PS4 violates Sony’s Terms of Service and can lead to a permanent console ban from PSN.