PKGDT: PS4 PKG Downgrade Tools GUI for Backporting Games by Gerfra | PSXHAX - PSXHACKS
OrbisSWU: The PS4 Update Tool Developer Research by TheoryWrong | PSXHAX - PSXHACKS
How to "downgrade" a PS4: full tutorial by Modded Warfare - Wololo.net
How to: Downgrade digital PS4 games to version 1.0 *updated* - GamePitt -
PS4 Release: PS4 NOR Validator 1.9.2/1.9.3, adds Syscon Patching for CoreOS swap ("Downgrade") - Wololo.net
How to downgrade PS4 9.50 Beta software to the previous version of the system software - YouTube
How to Downgrade PS4 from 10.50 to 9.00 Tutorial (New Update) - YouTube
GitHub - xXxTheDarkprogramerxXx/PS4_Tools: Collection Of Open Source PS4 Tools all in one Library All Written in C#
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How to Downgrade PS4 from 10.50 to 9.00 Tutorial - YouTube
How to Downgrade PS4 from 10.50 to 9.00 Tutorial (New Update) - YouTube
How to Downgrade PS4 from 10.50 to 9.00 Tutorial + Download - YouTube