Apple has ceased signing multiple iOS and iPadOS updates, preventing users from installing the updates, even if they are showing as available for their device, reports MacRumors.
The affected versions include updates to iOS 12, iOS 15, iOS 16, and iOS 18.
On Monday, Apple released iOS 18.7.4, iOS 16.7.13, iOS 15.8.6, and iOS 12.5.8 for older iPhone models, along with iPadOS 15.8.6, iPadOS 16.7.3, and iPadOS 18.7.4 for iPad models.
The report says the updates were released to allow core system services to continue functioning on older devices that no longer receive major iOS releases. One of the fixed issues prevented some devices from being able to make emergency calls.
Affected iPhone and iPad models include:
None of the updates fixed security vulnerabilities or offer new features. According to Apple’s release notes, the main purpose is to replace an expiring security certificate.
Apple has not shared its reasoning behind stopping signing the updates. However, in a support document shared by 9to5Mac, Australia telecommunications company Telstra says it is currently investigating an issue preventing some older Apple devices from connecting to its network, including calls to 000. They recommend customers using these devices delay updating the software on their device until they confirm the issue is resolved.
Devices that may be impacted include: