Firmware update 1.65 launched yesterday (April 3), but was subsequently taken down due to a technical fault.
Update 1.66 rectifies the original's problems and adds several new features.
Users now have the option to retry and cancel following failed location searches, links are provided to the PlayStation Store for applications discovered on Near, and functional improvements have been made to games Unit 13 and Gravity Daze.
The original update, meanwhile, enables users to toggle notifications off, which disables alerts for received messages, friends signing in and other activities.
'After 10 Minutes' has been added as an option in Power Save Settings, while an arrow indicates when new activities are available in LiveArea and caps lock is supported by the on-screen keyboard.
Other enhancements include improved frequency of Near updates, a percentage bar that accompanies downloads and the option to download during sleep mode.
PlayStation Vita update 1.6 added video recording features and a satellite map app.
PlayStation Vita-compatible release Everybody's Tennis was recently pulled from PSN amid fears of piracy.
The PSP title, which was available to download for the PlayStation Vita, was said to contain a vulnerability "that could lead to the execution of external code".
Watch the UK PlayStation Vita advert below: