Is it risky for Apple 6 phones to downgrade the system?

Hello, Apple's mobile phones can only be upgraded but not downgraded.

Apple's official explanation for Apple's mobile phone can only be upgraded and not downgraded: In order to prevent the device from being downgraded to a software version that lacks the latest security updates, iOS uses a process called system software licensing. If downgrade is allowed, an attacker with physical access to the device will be able to install an earlier version of iOS and exploit a security vulnerability that has been remediated in the new version of iOS."

Apple has officially announced the official shutdown of October 17 and iOS 3 and iOS 110 System verification channel, iPhone, iPad, or iPod that has been updated to the latest iOS system will not be able to go back to the old version.

There are risks. 1. Precautions:

1. You can't downgrade after upgrading, and Apple phones can't be downgraded according to official regulations after upgrading.

2. Downgrading by flashing, this is risky, and sometimes it will become a brick, so it is not recommended to operate.

3. Jailbreak flashing, this will not be under warranty after Apple officially discovers it.

Second, the principle of operation.

1. The system upgrade is from low level to high level, if it becomes high level, it will not be able to return to low level.

2. Apple will no longer be warranted for unofficial operation.

Steps to downgrade after Apple 6p upgrade:

Function. <>

<>6. Click Replace Device to replace it with the device that needs to be downgraded.

7. Select the model "iPhone 6" for us

The Apple 6 mobile phone version can be downgraded after upgrading, and it can be downgraded to the iOS system, and the downgrade operation method is as follows:

4. Connect your iOS device to your PC or Mac and turn on iTunes.

5. Connect the phone to the phone, iTunes will pop up a notification, indicating that the device has been successfully connected, then click Shift on the keyboard and check for updates in iTunes, and in the pop-up window to select firmware, select the firmware of iOS to recover.

Steps to downgrade after Apple 6p upgrade:

<>6. Click Replace Device to replace it with the device that needs to be downgraded.

7. Select the model "iPhone 6" for us

The iPhone iOS system adopts the recommended upgrade and mandatory upgrade strategy to keep the latest update, and once upgraded, it cannot be downgraded.

Are you looking to downgrade to iOS9? This is not possible because Apple has long closed the verification channel.

Now the lowest iOS version is.

The downgrade of the Apple phone has no effect on the phone. But the higher the Apple phone is upgraded, the more features it has.

Apple phone downgrade is good for some old Apple phones. For example, if the iPhone 5s mobile phone is still kept on the iOS 9 system, then relatively speaking, the system fluency will be greatly improved.

iOS (formerly known as iPhoneOS) is a proprietary mobile operating system developed by Apple for its mobile devices, providing an operating interface for many of its mobile devices, including iPhone, iPad and since iOS4, it is the second most popular mobile operating system in the world, second only to the Android system developed by Google.