① Why did Apple downgrade the iOS system version?
iOS jailbreak has always been a struggle with Apple, because Apple usually has a higher version.
This means that the latest iOS version is rarely jailbroken, and the old version is the first choice for jailbreak enthusiasts because there are a large number of kernel vulnerabilities available.
② What is the iOS kernel vulnerability?
Generally, a mirrored kernel like the iOS system has as large and complex software, usually there are some bugs and vulnerabilities that need to be modified.
With each new feature or change, Apple developers also have the opportunity to introduce new bugs in the kernel. Security researchers can find these vulnerabilities through lengthy reverse engineering meetings and even by viewing open source code.
Once such vulnerabilities are discovered, you can write the exploit program. Of course, depending on the severity of the vulnerability, it can affect the critical security components of the iOS kernel. By exploiting the vulnerability, hackers can bypass or disable the sandbox, disable CodeSign that enforces trusted code signing identities, enable full ROOT access, and so on.
This is also the secret of ios jailbreak. If there is no such kernel vulnerability, the known jailbreak will not exist unless it is a CheckM8 compatible device.
In this case, you want to downgrade using FutureRestore, which is a tool, even after Apple stops signing the vulnerable firmware,It can also help downgrade or upgrade to complete the jailbreak of the old version.
③ Apple iOS 14.7.1 system update content
In the early morning hours of July 27, Apple released the official version of iOS 14.7.1 system. The author mentioned earlier that Apple will surely launch it urgently. An official version system.
is the official version of iOS 14.7.1. This version is mainly to fix the problem that Apple Watch cannot be unlocked.
Earlier, Apple mentioned this on the official website. In the iOS 14.7 system, unlocking the device with a "touch ID" fingerprint may result in the inability to unlock the Apple Watch , and mentioned that it will It will be fixed in the next version. So if there is no accident, it must be version 14.7.1.
④ Apple iOS 14.7.1 system version update content
Judging from the above content, it is actually only a bug fix, no new features appear, after all, the update package is only 124 MB. We know from the description of the update package that we have fixed an issue where iPhone models equipped with Touch ID could not unlock the paired Apple Watch through the "Unlock with iPhone" function.
⑤ Which Apple devices recommend the four points for upgrading?
①Mobile phone with fingerprint unlock function
②Upgraded to iOS 14.7 system phone
③Use Apple Watch watch
④Turn on "Unlock with iPhone" function
These four points above if you All meet the conditions,It is recommended that you upgrade, other equipment models do not have to toss.
In addition, if you are still using the old version of the system, if you don’t know what the iOS 14.7/14.7.1 system update is, please see the following figure to understand. If you think the following points are useful to you, you can upgrade the system.
as a supplement! In addition, in addition to the iOS 14.7.1 system, Apple also urgently introduced iPadOS 14.7.1 and macOS Big Sur 11.5.1 systems. All are mainly to fix BUG, and there is no new function.
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