Method for forcibly restarting the mobile phone:
① ① models of funtouch OS 3.2 and subsequent systems: press and hold the "power button"+"volume reduction button" 10 second at the same time;
② Press and hold the top round key 10 second or more to forcibly restart the mobile phone (NEX 3/NEX 3S is applicable);
③ System model before ③Funtouch OS 3.2: Press and hold the "power button" for more than 12 seconds.
If it can be used again after operation, you can try the following methods to avoid the recurrence of the fault:
1. If running a single application crashes, please try to upgrade the application to the latest version;
2. If the storage space of the device is low, the system performance will drop sharply, resulting in the application being stuck or stuck. It is recommended to use I housekeeper to clean the space regularly;
3. The new version of the system improves the compatibility and stability, and optimizes the performance. Please go to Settings-System Upgrade (some models are Settings-My Device -iQOOUI Version) to check the system version information. If it is not the latest version, it is recommended to upgrade the experience.
4. Enter Settings-System Management/More Settings-Backup and Reset/Restore Factory Settings-Clear all data-Clear immediately.
Note: "Clear all data" will restore the mobile phone to its initial state and delete all data in the system space of the mobile phone, including account number, system and application data and settings, and installed applications. Please back up the important data on your mobile phone before operation.
5. If the above methods are not solved, please back up the data on your mobile phone in advance and take it to the nearby vivo customer service center for processing.
Tips: It is recommended to bring relevant purchase vouchers (such as purchase invoices/warranty cards/ID cards) when you go, and call the service center staff in advance to ensure that the staff will go again during normal working hours, avoid running empty, and pay attention to safety on the way back and forth.