Restore with hard reset or Recovery mode Tecno Spark
Restore with hard reset or Recovery mode your Tecno Spark can solve problems that have not been solved with a normal factory reset.
1- First turn off your Tecno Spark completely.
If you can not unlock the screen press and hold the power button for about 20 seconds and the phone will turn off.
2- Keep holding on volume down and power keys together for a few seconds in your Tecno Spark.
In some devices according to the Android version the combination can be the power key and the volume key up.
3- When the Tecno logo is displayed release the buttons.
4- Move through the menu with the volume up and volume down keys until you reach the Recovery Mode option and press the power button to access.
5- Use the volume up and volume down keys to select the wipe cache partition option and press the Power button to activate the option and clear the mobile cache.
6- After a few seconds you will return to the previous screen with the volume buttons go to the option wipe data factory reset and press the power button to enter.
A screen with many NOs and a YES will appear with the volume keys again go to the YES and press with the power key.
Источник: rutube.ru