To perform a "hard reset" key combination, follow these steps:
1- off the mobile
2- pressing the "VOLUME +" without pressing the release button ยท ON "holding both buttons
3- Release the keys when the Orange logo appears (or related company)
4- ANDROID snowman and a phrase that says "NO COMMAND" appears
5- press the button "ON" once and usual for the reset screen appears, with the key "VOLUME -" to move and "VOLUME +" to execute the command
To make the "hard reset" via the menu, follow these steps:
1- ent on the menu
2- go to SETTINGS
3- go to BACKUP
4- go to RESTORE FACTORY DATA