For Galaxy A5 2016, the June security patch comes with build number A510MUBS3CQF1, for Galaxy Tab A 2016 (with S Pen) the build number is P585JXU2BQF1 and lastly for Galaxy Tab Iris it is T116IRDDU1BQF1. All the three devices are receiving the update via OTA (Over the air) in phase wise manner.
As is the case with any security patch, the update takes care of various security vulnerabilities and brings along bug fixes. You can also expect under-the-hood performance improvements as well as other minor system enhancements too.
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It is advisable to connect to a good Wi-Fi network before downloading the update and while installing the update, keep your handset charged as high as 50 percent.
In case you haven’t received the update yet, you can check for it manually via the device settings. Go to Settings – About – Software updates.