Originally Posted by PLaGu3
I'm PLaGu3 and i'm here to learn how to downgrade from 4.21 to a jailbreak version. Hope made it.
Welcome to the forum
Unfortunately, Sony blocked the downgrade, with a hardware flasher, option in the 4,21 firmware. The highest downgradeable firmware is 4.20. Your only option is to sell your ps3 and find one with lower firmware or better yet, one with 3.55 firmware.
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