Connect your Vita. The Windows tool will detect your firmware version (3.74). Click "Install Exploit." It will copy a fake "email" or "video" bubble to your Vita that contains the payload.
The 3.74 firmware is the final firmware. Because Sony is not updating it, the hacking community has had two years to dissect it completely. Every vulnerability in 3.74 is now documented. It is as safe as a dead platform gets. ps vita 374 firmware
On your Vita, tap the h-encore² bubble. Wait 10 seconds. The screen will flicker and return to the LiveArea. You are now running HENkaku (Homebrew Enabler). Connect your Vita