How does Meizu mobile phone clear all data?

Method 1: You can set it in your mobile phone-> About mobile phones-> Storage->; Restore factory settings-> Tick "Restore System" or "Format Storage Disk", and click Start Restore (Start Clearing). "settings-> in Flyme6 system; Storage and backup-> Restore factory settings. 1. Check Restore System to erase personal data, such as contacts and all applications. Flyme 5. 1 After the system is restored (the screen lock password needs to be verified before setting the screen lock), the original bound Flyme account will be displayed by default after booting. 2. Check the format storage disk and delete all stored data, including pictures, videos and local backup files. Please back up your important data to your computer or cloud before operation. 3. Check these two items. If both items are selected, all data in the mobile phone will be cleared and factory settings will be restored. Method 2: Press and hold the volume "+"and the power button at the same time for about 15 seconds. After entering the system upgrade page, press the volume to increase 5 times, and then press the volume to decrease 5 times to enter the double clear page.