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https://www.gamesandconsoles.org/2018/10/28/ps3rilasciato-3-15-spkg-downgrader-da-cfw-4-xx-a-3-15-con-un-pup/
[PS3]Rilasciato 3.15 spkg downgrader: da CFW 4.XX a 3.15 con un PUP