It is recommended that you use Wi-Fi to download and install the update in order to avoid data charges. It is also recommended that your device is fully charged before you initiate the update. If you havent received the notification you can also manually check for the update by heading over to Settings > Phone Update > Check for updates.
Once you receive the notification to install the update click the notification message and follow the onscreen instructions to install the update. The entire process may take around 15 – 30 minutes and you will not be able to use your device during the process. The device may restart several times during the update process which is normal, but once the update is complete it is best to restart one last time for good measure.
The 1532.5951.1250.1012 update for the Nokia Lumia 822 has the following new features and improvements
- More efficient Messaging, allowing you to save draft messages, edit forwarded multimedia messages, select multiple recipients at once, and respond to a call with a text message
- Improved performance, audio quality, and connection stability for Bluetooth
- Improved compatibility, stability, and performance for micro-SD card
- Improved battery level metering
- Improved stability, speed, and functionality for the camera
- Can now better control data costs: you can prevent automatic fallback from a Wi-Fi network to a mobile data network and keep Wi-Fi always on to off-load network usage to Wi-Fi
- Performance and stability improvements
source – Nokia