Firstly: English Answer

Erasing all content and settings on a device means permanently deleting all data, applications, and settings from the device. This includes:

* Personal data: Contacts, messages, photos, videos, documents, and other files
* Applications: All installed apps and their associated data
* Settings: Wi-Fi passwords, Bluetooth connections, and other device configurations

Erasing all content and settings is a drastic measure that should only be performed when necessary. It can be useful in situations such as:

* Selling or giving away your device
* Experiencing severe software problems that cannot be resolved by other means
* **Resetting the device to its factory default settings**

Before erasing all content and settings, it is crucial to back up any important data. Once data is erased, it cannot be recovered.

To erase all content and settings on most devices, follow these steps:


1. Back up your important data.
2. Go to the device settings.
3. Select the option to erase all content and settings.
4. Enter your passcode or password when prompted.
5. Confirm that you want to erase all content and settings.

The process of erasing all content and settings can take several minutes or longer, depending on the device and the amount of data stored on it.

**read more >>

"Erase all settings" means the way you have personalized your iPhone in the settings app will be restored to the way it was when the device was turned on for the first time. It does NOT mean the device will be completely erased, as Apple insists certain applications and default settings remain on the device.read more >>