You usually need to see the currently signed version of iOS and the version that is no longer signed for your device. Please select your device model from the list and you will be automatically redirected to the results page *.
Apple only signs several versions of iOS at a time, usually the latest version. This is to prevent users from downgrading to the older version of iOS and jailbreaking at will.
Once Apple releases a new version of iOS, the previous version of 1-2 may remain signed for days or weeks before being signed.
After the release of the new iOS, the signing of the old software update will be stopped. After signing an iOS version, it cannot be downgraded or upgraded.
Unless you save the SHSH2 blob while it is still signed, SEP and baseband are compatible, and there is a way to set the random number generator currently running on your version.
When trying to downgrade the iOS version, it is necessary to study whether the SEP and baseband of the currently signed version are compatible with the version you are trying to downgrade. Otherwise, the downgrade may fail and make your device brick, which will require you to update to the latest iOS version.
Then this version may not escape for months. In order to be able to use FutureRestore to downgrade the iPhone/iPad or iPod Touch on the device, you need some important files, your device and a lot of patience and caution. One mistake, and you ruin your chances of demotion.
①FutureRestore tool, both Windows and macOS can be downloaded here.
② The iOS version that needs to be downgraded and the SHSH2 blob file of the device. Shsh2bblobs cannot be transferred from one device to another, nor can it be transferred from one iOS version to another.
③ Need to be downgraded to. IOS version of IPSW file. Can be obtained from ipsw.me
④ SEP and baseband files of Apple devices come from the currently signed iOS version. Make sure it is compatible, but not all versions are from one version to another.
⑤USB-Lightning data cable and your iOS device (the battery power is at least 60%).
⑥ Random number generator setting tool for iOS. These usually require kernel vulnerabilities to unlock NVRAM.
Since the release of the beta version of iOS 15.0, many users have roughly experienced it, and it is determined that it is only an upgraded version of iOS 14, which does not make us feel that it is a brand-new system.
There are two hidden functions that you may not know. Today I will mainly talk about these two functions. Is iOS 15 system worth upgrading?
① offline Siri function:
The previous system could not use Siri without a network. I think everyone should know this problem.
In the iOS 15.0 system, Siri has supported offline use, but! Only offline operations can be used.
For example: counter, alarm clock, making phone calls, sending messages, enjoying * * *, starting App, controlling audio playback and setting, etc. These application functions can be operated through Siri (offline). Isn't it amazing?
② shutdown positioning function of IOs15:
It is impossible to find it until the system is shut down. It just means that you can still locate the iPhone when it is turned on and off.
This function is located in Settings -iCloud- Find-Find My iPhone. Find the "query" network option, turn it on, and the turned-on iPhone can be located without a network, provided that there is an Apple device nearby.
In the iOS 15.0 system, positioning is also supported when the phone is turned off. As long as your device turns on the "query" network option, the device is turned off after being lost or the battery is low, and there is an Apple device nearby, you can still locate it.
When you turn off the Apple phone manually, there will be a prompt at the bottom.
Say it again! When other devices may close the page, a prompt will pop up at the same time, and the iPhone can still be found after closing.
It should be noted that! When you "query" the network option, you must turn it on to prevent the device from being lost and turned off. Of course, if there is an Apple device nearby, you still can't locate it.
That's all for now. Apple users, what do you think of this shutdown positioning function? Leave a comment at the bottom of the article! More scientific and technological information, daily information, please pay attention!
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