Will the data be erased after Apple's mobile phone is downgraded?

The data is still there after the iphone is downgraded, and the data will not be cleared after the downgrade. Once an IOS device is upgraded, it cannot be downgraded.

IOS is a mobile operating system developed by Apple. Apple announced this system for the first time at Macworld conference on June 9, 2007. It was originally designed for iPhone, and later applied to iPod touch and iPad. IOS, like apple's macOS, belongs to a commercial operating system similar to Unix.

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Precautions:

Need to evaluate whether the mobile phone needs to be downgraded and whether it should be downgraded to the previous old version. After all, the new version has new functions and features. If you are using a mobile phone and you don't feel that it is running slowly, there is no need to downgrade it.

If you decide to downgrade, you need to see which version is suitable for downgrade, not that the lower the version, the better. In all versions of Iphone6, it is enough to downgrade to the version before iOS 10.2, because it is in iOS 10.2 that the performance is limited.

In the Iphone7 version, just downgrade directly to the iOS 1 1.2 version, because it is in this version that the performance is limited.

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