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So far, there are no known methods of downgrading a retail vita unit. Probably the only way is Manufacturing mode or some other sort of QA flag set in Syscon. Alternatively you may force lower fw load with a Secure Processor (commonly called "F00D") exploit that happens before prog_rvk.srvk is loaded and that patches it (F00D) to use legacy/factory keyset only.

However, it is possible to downgrade a Testing Kit or Development Kit Vita, as seen in this video:

Attempts[edit | edit source]

TheFloW tried downgrade from 3.67 back to 3.60, but it didn't work