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PS4 News - UPDATE on Downgrading systems, someone has successfully done it - YouTube
PS4 7.55 Downgrade To 5.05 - YouTube
Update the PS4 to 5.05, 6.72, or 7.02 Firmware | PS4Mod.com
iFenix on Twitter: "Playstation 4 | 7.55 down to 6.72 | Downgrade!!🔥💪 Another FW Revert success! By - @Centrinouk SYSGLITCH_DOWNGRADE : https://t.co/HpLjtfHssH https://t.co/Lj2QGacMPf" / Twitter