How the Nintendo Switch prevents downgrading http://wololo.net/2017/08/24/nintendo-switch-prevents-downgrading/ …pic.twitter.com/6b7vbblXHh
Sony did not (and still does not) uses eFuses to prevent downgrading (they are dedicated to store per console settings at factory)
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Thanks for the callout. What are the efuses on the ps3 cpu used for?
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The per cpu key used for metldr and bootloader encryption is programmed using the fuses.
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Thanks. I have updated the article with a correction. Might take a while for caches to refresh.
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Downgrading is prevented using hashes in syscon's NVS, revocation lists (on ps4/ps vita) and stripping PUP header keys from existing modules
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That means in theory if we could backup and restore ps vita/ ps4 syscon nvs + spi flash or not flash then we could downgrade it.
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