[neutrel]

Originally Posted by pereb27 Those checks are not imposed by firmware 4.0, they were implemented in 3.55. The problem is what it checks is the syscon which is the one element in the PS3 that doesn't get downgraded. You cannot downgrade a 3.56+ syscon, and 3.55+ checks for hashes in syscon and compare them with CoreOS files in NOR. Since hashes mismatch, you brick. That's why downgraded consoles must have those checks disabled. As far as I know those checks aren't presentg in 3.50 or lower, only 3.55 (not 100% sure about that). However even if you downgrade via service mode or QA flag to 3.41 or 1.02 if you want, the syscon will stay 3.56+, it simply cannot be downgraded. So if you update to a 3.55 again after this, if the 3.55 hasn't those checks patched, you brick.

now is clear why is not going to work. thank you =)