Update brings a number of Android-related changes, as well as a monthly Security Maintenance Release, fixing 68 security-risking glitches (or, if you want to sound fancy, Common Vulnerabilities and Exposures). Updates are not available in all the world's regions at once, so be patient - if you cannot download them now, you are bound to be able to soon. If you wish to check whether or not the upgrade is ready for you to download, follow this route: Settings > About Device > Software Update > Update Now.
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