Second method:
Soft reset, also known as soft reboot, is the restarting or rebooting of a device like a computer, smartphone or tablet. It closes all applications and clears any data in random access memory. Soft resetting is usually performed to repair malfunctioning applications.
How To Soft Reset Your Android Devices
Factory Reset Xiaomi Mi Mix 2 From The Settings Menu
If you can access your Xiaomi Mi Mix 2 factory data reset menu, then you can completely erase all the data, settings and content on your device. This process will turn it to factory default settings like the first day of the Smartphone.
You can finish Xiaomi Mi Mix 2 factory reset process via settings menu by following the below steps.
v Be sure that your device has at least %50 charge life.
v Logout from your Google Account to remove the FRP Lock.
v Use Backup and Restore option to backup your data.
1. Open the Settings menu.
2. Scroll down to the bottom of the page and tap General Management.
3. Tap the Reset menu and select the Factory Data Reset.
4. Read the information on the screen and tap Reset Device.
5. Enter your device pin, screen lock or password.
6. Tap Delete All.
7. After a few minutes, your device will reboot and factory data reset process finishes. At the welcome screen, login your Google account and you can start Restore Data process.