Android 4.4.3 KitKat has arrived today and first to receive it is Nexus 5 handsets which are on US network Sprint. The new build number of Android 4.4.3 is listed as ‘KTU48F’. The ‘KTU’ text code is usually used for all the Nexus 5 unlocked US models, which means that all the other models might get the update files later this week, too.
Google has fixed mostly bugs regarding Bluetooth and Wi-Fi connectivity, but known problems with data connection loss, random reboots, missed calls and various camera bugs have also been fixed.
If you do get the update then you should simply click the Download button, then press Install and wait until your Sprint Nexus 5 completes the process automatically.