Summary
According to Sony’s official changelog, System Software Update 3.74 does the following:
Mandatory Device Passwords: To enhance security, signing into the PlayStation Network (PSN) now requires a Device Setup Password rather than your standard account password. Removed Features: ps vita system software update 374 updated
How to Update Your PS Vita to Version 3.74:
Sony released this update primarily to enhance account security for legacy consoles. The official changes include: Device Setup Password Required Report: PS Vita System Software Update 3
Sony has released a new system software update for the PlayStation Vita (PS Vita), bringing the version up to 3.74. This update aims to improve the overall stability and performance of the system.
Long live the Vita Island.
For the homebrew and "jailbreaking" community, the update was initially a hurdle. However, developers quickly adapted, providing "version spoofing" tools through HENkaku and other plugins that allow modified systems to access the store while remaining on more flexible, older firmware versions. Conclusion