Using the recovery PUP will wipe your console and reinstall the 9.00 firmware cleanly. As noted on GBAtemp, "Installing REC pup formats your console, wiping everything".
If you've accidentally updated your PlayStation 4 to firmware version 9.03 and now want to go back to the highly exploitable version 9.00, you're not alone. Many users in the PlayStation modding community have been searching for a reliable "downgrade ps4 903 to 900 fix" ever since Sony pushed out the 9.03 update shortly after the widely popular 9.00 jailbreak was released. downgrade ps4 903 to 900 fix
With a steady hand, he soldered tiny copper "jumpers" to the motherboard, connecting the console to a teensy-sized external flasher. His monitor flickered with lines of raw hex code. It was a language of zeroes and ones, a battle between the factory-locked firmware and his desire for control. “Validating flash dump...” the screen read. Using the recovery PUP will wipe your console
Once a PS4 is updated to 9.03 (or higher), you cannot revert to 9.00 because: Many users in the PlayStation modding community have
A: The firmware revert method works for any firmware pair where the previous version is the one you want to return to. For example, you can revert from 10.50 to 10.01 if that was your immediate prior version. However, each attempt carries the same risks.
before starting. Without these, recovery from a failed downgrade is impossible. "If you do not have clean usable dumps of Nor and Syscon" you will not be able to restore the console to a working state.