A new PlayStation 4 firmware update is now live in all regions, bringing some improvements to the system.
The new update, update 6.51, introduces unspecified system performance improvements. Sadly, it seems like this is everything this update does, judging from the official notes.
This system software update improves system performance.
The previous PlayStation 4 firmware update, update 6.50, introduced some new features such as the ability to enjoy Remote Play on iOS devices and more.
You can now enjoy Remote Play on iOS devices. You can use(PS4 Remote Play) to connect to your PS4 system from devices such as smartphones and tablets. Download(PS4 Remote Play) from the App Store
You can now choose 720p when you broadcast using Niconico Live.This service is available only in certain countries and regions
You can now change the button assignment to perform “Enter” operations from thebutton to thebutton. Select(Settings) > [System], and then select the checkbox for [UseButton for Enter].This option is available only for specific countries and regions.