Based on my readings, looks like that is Update 2 (GDR 2 for Windows Phone 8.1). Did you notice any changes in the layout in the settings?
The
change log for that OS version includes:
Settings. Find your phone settings more easily. Tap one of the new settings categories to jump to it, use Search to find a setting, or pan down to peruse in the traditional way. Additionally, phone settings can now be pinned to Start.
Name your phone. Give your phone a name without connecting to a PC. Just tap Settings > About > Edit name to name it.
VPN. Now you can use certificates to sign in for L2TP VPN connections. Always-on VPN profiles are now supported too, so you're automatically and always connected.
Bluetooth. Type with more than your thumbs. Use an external Bluetooth keyboard and watch the words fly on your phone. And now get your text messages right from your car if it has a compatible Bluetooth system.
App privacy permissions. Now you control whether an app can access your contacts, calendar, camera, microphone, and text messages. Just tap Settings > App permissions to get started.
Reset Protection. Provide an extra layer of protection for your phone, so that if it ever ends up in the wrong hands, it can't be easily reset or reused. (This feature is available only for specific phones.)