How to: Downgrade digital PS4 games to version 1.0 *updated* - GamePitt -
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How to "downgrade" a PS4: full tutorial by Modded Warfare - Wololo.net
Downgrading Firmware - PS3 Developer wiki
Scena PS4] Eseguito con successo il downgrade hardware della console PlayStation 4 dal firmware 7.55 al firmware 6.72 – BiteYourConsole
Uno de los diseñadores de God of War habla del downgrade