For best performance, keep your phone updated with the latest available Android software.
To check what version of Android your phone is running:
Your phone notifies you if an Android software update is available.
To manually check for updates, go to Settings > System > Advanced > System updates.
If an upgrade is available, follow the onscreen instructions to install it.
You can't downgrade to a previous software version after installing an update.
Types of updates:
To see if an OS update will be available for your phone, or if your phone is still eligible for security updates, see the software update website for your country. Our support agents get their Android update information from here too. If the website doesn't have a update release date for your phone, then we don’t know the release date yet.
For Android OS updates, with several phone models, regions, and distribution channels we may have hundreds of software versions to test before releasing an update to your phone. Because dependencies on carriers and other key partners for certifications, independent testing, and requests for changes take more time, all phone owners don't receive updates at the same time, even in the same region.