Yes, you can "downgrade" a PS4 from firmware 9.03 to 9.00, but only through a highly technical hardware process known as
You must use the Full Reinstall (Option 7) method with the latest official firmware file. This clears the version conflict by installing the highest available version, restoring the console to a working state. downgrade ps4 903 to 900 fix
If you want, I can: