Apple today has ceased to sign iOS 18.2.1, which means that iPhone users who upgraded to iOS 18.3 can no longer go to the previous version of iOS 18. Apple has published iOS 18.3 IL A week ago.
When new versions of iOS are published, Apple stops signing the previous version after a week or two. An update that is not signed cannot be installed on a iphone because there is a software verification verification on the server side. Currently, IPhone models compatible with ios 18 are only eligible to download and execute iOS 18.3.
By preventing customers from downgrading to the old versions of iOS, Apple guarantees that the devices are up to date with the latest safety improvements.
Apple iOS 18.3 update included a handful of Apple Intelligence updates and more than 20 security updates. One of these fixes added a vulnerability that could have been actively exploited on certain devices, demonstrating why it is important to maintain up -to -date iOS software.
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