UPDATE USING THE SOFTWARE UPDATE APP ON YOUR PHONE
You can update your wirelessly Over the Air (OTA). With Over the Air (OTA) updates you don’t need any cables or computer; you can simply download and install the update using your phone. Updates are free of charge, but to download the update, you need an internet connection. It is best to use a Wi-Fi connection to avoid mobile data transmission costs.
Software updates from Microsoft are safe to install, and your settings, apps, photos, and text messages remain safe and sound.
Step 1. For most phones, select Menu > Applications > (Tools >) SW Update.
Step 2. Select the updates you want to install, and follow the instructions shown on your phone.
Step 3. The update takes around 15-30 minutes, and you are not able to use your phone during the update installation.
UPDATE USING NOKIA SUITE
Before updating, use Nokia Suite to back up your phone, and you can be sure that your contacts, messages, calendar entries, tasks, web feeds, and other important stuff is backed up safely. The contents of your phone memory and memory card, such as photos and videos, are safe and won’t be affected during the update.
To update your phone, you need Nokia Suite software on your computer.
Connect your phone to your computer with a compatible USB cable.
Start Nokia Suite, and select Tools > Software updates. Then select the updates you want to download, and select Install.