You should always try to make sure that your phone has the latest software version installed so you get a better experience.
Before you update your phone, make sure that the battery is fully charged as it can take up to 30 minutes to complete. You won't be able to use the phone to make or receive calls or send messages during the upgrade, this includes emergency calls.
Nokia Software Recovery Tool is a desktop application that allows you to reset and recovery your phone. If you already have the software installed you’ll see a prompt to update when you next open it.
Nokia and Three release software updates for your phone from time to time.The software of your Nokia handset also requires updates, which you can now be easily installed thanks to the official Nokia Software Updater utility.Upgrade your mobile phone's operating system to get new features, fix bugs and solve any other errors. All you have to do is connect your phone to a computer with a USB cable.the Microsoft Software Updater does not install any pre-release of Nokia device software, but will restore the latest updates.The service can be used to restore the firmware on "bricked" phones which previously could only be done at local Microsoft Care customer service centres.