Apple has just turned off the iOS 11.2.5 verification channel on March 2, 2018, users who have installed iOS 11 are now unable to degrade, and the lowest version of DFU‘s official version is iOS 11.2. 6.
On the early hours of February 24, Apple released the official iOS 11.2.5 firmware update that focuses on bug fixes and security updates. However, just today, Apple officials again closed the iOS 11.2.5 system verification channel, so that some users have been upgraded to iOS 11.2.6 can no longer be returned to the previous versions.
iOS 11.2.6, which is just a routine repair update and promises fix the nasty crash bug on iPhone, iPad and iPod touch. A supplemental update to macOS 10.3.3 fixes it on Mac and watchOS 4.2.3 fixes it on Apple Watch. Apple’s tvOS also received an update that fixes the same bug on Apple TV. However, Apple stopped signing iOS 11.2.5 for more than a week after the update.
On its security update page, Apple has credited an anonymous researcher for discovering this bug. Security update pages for all updates carry the same details as follows:
- Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation
- Impact: Processing a maliciously crafted string may lead to heap corruption
- Description: A memory corruption issue was addressed through improved input validation.
- CVE-2018-4124: an anonymous researcher
In general, to shut down the verification channels of the old system can effectively prevent the fragmentation of iOS ecosystem and prevent some devices from escaping.
In fact, before that, Apple has closed iOS 11.2.2, iOS 11.2.1, iOS 11.2 and other different versions of the system authentication channel. This means that, so far, users want to upgrade the system, you can only brush iOS 11.2.6 official version and iOS 11.3 beta system, in addition to wait for the updated version of the system was introduced.
At present, Apple CEO Cook has confirmed that ios11.3 will be released in the spring. In function, iOS 11.3 in addition to adding a few functional options, you can also display the battery performance and suggest whether the battery needs repair. However, want to use these features, you must now complete the relevant settings on the phone, and must be iPhone 6 and later models. If you are iPhone5S and some models, then smart missed missed.