It sounds like you’re referring to PS Vita firmware 3.74 and HENkaku (the homebrew enabler). To clarify: HENkaku originally launched for firmware 3.60, but over time the community extended support to higher firmwares through HENkaku Ensō (persistent hack) and later h-encore² / HENlo exploit chain.
PS Vita 3.74 HENkaku setup refers to the latest (and likely final) stage of the PlayStation Vita homebrew scene ps vita 374 henkaku exclusive
The Downside of 3.74: Because it is a temporary exploit, you must relaunch the h-encore² app every time you perform a hard reboot of the console to reactivate your homebrew features. Exclusive Benefits of a Modded Vita It sounds like you’re referring to PS Vita firmware 3
Requirements: