PS4 9.60 Downgrade to 7.55 Official - Playstation Portal
How to: Downgrade digital PS4 games to version 1.0 *updated* - GamePitt -
PS4 News - UPDATE on Downgrading systems, someone has successfully done it - YouTube
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Backport PS4 Games From 6.72 To 5.05 - Downgrade PKGs
ps4 exploit for 7.51 or downgrade? | Page 13 | GBAtemp.net - The Independent Video Game Community