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How to downgrade PS4 9.50 Beta software to the previous version of the system software - YouTube
Downgrade from 9.03 to 9.0 or some other version : r/PS4Hacks2
It is apparently possible to revert your PS4 to its previous firmware version, without any backup - Wololo.net
PS4 firmware update 8.52 is out, here is the patch note | TheSixthAxis
SonysNightmare 🏴☠️ on Twitter: "🔥 FINALLY AFTER HOURS AND HOURS OF WORKING AND TESTING FINALLY THE MOMENT HAS COME A DOWNGRADE TOOL FOR PS4 ✅️ LOAD PS4 DEBUG PAYLOAD FROM ANY HOST