Apple today released iOS 12.5.6 for older iPhones and iPads that need critical security updates. It comes in build number 16H71, which will be an update for models that do not go on iOS 13 and above.
The update supports both iPad Air, iPad mini 2 and iPad mini 3, as well as the 6th generation iPod Touch, iPhone 5s, iPhone 6 and iPhone 6 Plus, all of which are not included in iOS 13. You will always receive important updates.
And in iOS 12.5.6, it will be an update to fix the same vulnerabilities as the release.Update iOS 15.6.1 Went in the middle of August last year. which we recommend to update as soon as possible
Source: 9to5mac