Samsung has released a new update A520FXXU4BRD1 for Galaxy A5 2017 smartphone. The new update has added latest Android security patches for the month of April.
The latest Android April Security patch fixes Common Vulnerabilities and Exposures (CVE) in the open-source Android OS. In addition, there are various other fixes and improvements.
Galaxy A5 2017 Update A520FXXU4BRD1 will gradually release to everyone. You can also check manually for updates, go to Settings > About device > System update.
Make sure you have enough charge on your device at least 60% to 70% before downloading the update