Apple has stopped signing iOS 12.3.1 and iOS 12.3.2, leaving iOS 12.4 as the only version now available for iPhone, iPad and iPod touch. That is, of course, beyond today's iOS 13 and iPadOS 13.
Apple generally stops signing older versions of its updates – and prevents them from being installed on devices – when a newer stable version has been out in the wild for a while.
This means that Apple can make sure that old versions are no longer hanging out as needed, while ensuring that the new software security fixes are applied where available.
Apple released iOS 12.4 to the public last month, and has now stopped signing older versions of the software just 9 days after launch. The new update added support for the Apple Card, mainly with the credit card itself expected to be announced shortly.
With iOS 12.4 now the only release version of iOS available to users, Apple continues to test iOS 13 and iPadOS 13 with developers and those who are part of the public beta program. These updates are likely to be made available later this year, probably in September. This timeframe also includes the release of iPhones from 2019.
The major iOS 13 and iPadOS 13 updates are set to provide many new features when they come with the iPad specifically and get loads of new features. Users of an iPad Pro will also be able to make better use of the power of the tablets when pressed on iPadOS 13, including proper support for external storage via the USB-C port.
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