vivox21 restore factory settings

How to clear all data: Go to phone settings--more settings--backup and reset--clear all data (this operation will delete all data in the system space, including: text messages, contacts people, notes, etc.).

Warm reminder: If you do not check the box to format the phone's USB flash drive or SD card, the data in the phone's USB flash drive and SD card will not be deleted. It is recommended to back up important data on the phone before operation.