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https://www.gamesandconsoles.org/2019/09/01/psvitaguida-su-come-effettuare-il-downgrade-da-fw-3-71-o-3-72-a-fw-3-65-3-60/
[PSVITA]Guida su come effettuare il downgrade da FW 3.71 o 3.72 a FW 3.65/3.60