Update Lumia Device to Windows Update

All the Windows Phone 8 users would get the new Windows Phone 8.1 with Cyan update. The Lumia 625 and 925 users are already receiving the OTA update globally, including India.

Users can manually check for updates from Settings, Phone Update, Check For Updates. You can check if the software update is available in your region / operator for :

• Lumia 520 
• Lumia 525 
• Lumia 620 
• Lumia 625 
• Lumia 720 
• Lumia 820 
• Lumia 920 
• Lumia 925 
• Lumia 1020 
• etc

How to Update :

Step 1. Your phone notifies you when an update is available for you. You can also check for updates, just tap Settings > Phone Update.

Step 2. To view and to install the updates, tap the notification message, and follow the instructions shown on your phone. You can install the update immediately, or postpone the update to a more convenient time.

Step 3. The update should take around 15-30 minutes, but a major update could take up to 2 hours to complete depending on your phone model. You are not able to use your phone during the update installation. Follow all the update prompts, and do not worry if your phone restarts several times during the process, that is completely normal.

Reference - Microsoft