Download the official from the official PlayStation website.
There are three standard methods to securely download and apply this firmware to your handheld system, depending on your current connectivity options. Method 1: Directly via Wi-Fi (OTA)
The is a crucial security update. Whether you are downloading it directly on your console or using a computer to update, it ensures your device remains compatible with the current PlayStation Network security standards.
Download and install the Content Manager Assistant on your computer. Connect your Vita to the computer via USB.
Download the official firmware from the Sony PS Vita System Software Page .
If you want to play official games that require a higher firmware version (like Persona 4 Golden or newer physical releases) AND you want to keep your Vita "activated" on the PlayStation Network to download your purchased games, updating to 3.74 and using h-encore² is a valid, albeit slightly less convenient, path.
PS Vita System Software Update 3.74: Everything You Need to Know
If you are encountering a specific error code during the update, could you tell me what it says? I might be able to help troubleshoot. PS Vita System Software (US)