Where to find official support
The PS Vita homebrew community is vibrant, allowing users to emulate retro games, run plugins for overclocking, and use custom themes.
: For PlayStation TV, you can update via a USB flash drive (requires a folder structure: PSVUPDAT.PUP PlayStation Impact on Hacked/Modded Systems Breaks Custom Firmware (CFW)
It looks like you're looking for the (often referred to as 3.74, not 374) download.
Download the update file (named PSVUPDAT.PUP ) from the PlayStation support page.
Here is a breakdown of what the update does, why it matters, and whether you should install it.
System Software 3.74 is a historic update. Released in late 2021, it wasn't designed to add new features like YouTube or Bluetooth audio support (features users had begged for for years). Instead, it was a functional necessity to keep the console alive after Sony announced the shutdown of the PS3 and Vita PlayStation Stores.