Apple recently released iOS 13.4 and pushed iOS 12.4.6 to older models. At present, the iOS 12.4.6 IPSW format recovery image file has been released, and users can download and install it themselves.
iOS 12.4.6 contains important security updates, and older users are advised to download and install them in a timely manner.
Devices that can update iOS 12.4.6 include iPhone 6 Plus, iPhone 6, iPhone 5s, 6th generation iPod touch, iPad Air 1, iPad Mini 2 and iPad Mini 3.
It is recommended to backup iPhone or iPad data to iCloud, iTunes or macOS before starting the system software update.