Note that you can use either the recovery firmware or the retail firmware. A USB Key with 2GB of space (you might get away with less, but worst case scenario you have a 1GB update file to fit on there).Check our quick guide below to get it right: 0. Updating your PS4 manually is simple and just requires that you download the right firmware update file, onto a USB stick. Remember, if you install 9.03, you can’t go back to 9.00 later on. With the recently released PS4 Jailbreak for Firmware 9.00, a lot of people are wondering how to upgrade to 9.00, without going “too far” and install 9.03 by mistake.
