Apple Releases iOS 12.5.6 Update for Older iPhones and iPads With Vulnerability FixesApple today released an iOS 12.5.6 update for older 
iPhone, iPod touch, and 
iPad models that are not able to run the current version of iOS, 
iOS 15.
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https://images.macrumors.com/article-new/2014/09/iphone6plus.jpg" alt="" width="800" height="597" />
The update can be downloaded over-the-air by opening up the Settings app, tapping on "General," and selecting the "Software Update" option.
The iOS 12.5.6 update 
fixes a major vulnerability that was actively exploited, so it's worth updating right away if you have an older device. The  WebKit vulnerability was already fixed in the 
iOS 15.6.1, 
iPadOS 15.6.1, and 
macOS Monterey 12.5.1 updates.
Devices that cannot be updated past iOS 12 include the ‌iPhone‌ 5s, ‌iPhone‌ 6, ‌iPhone‌ 6 Plus, iPod touch 6, original 
iPad Air, 
iPad mini 2, and ‌iPad mini‌ 3.
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Apple Releases iOS 12.5.6 Update for Older iPhones and iPads With Vulnerability Fixes