If you want to make a reset using the device options to return to the factory state, you have to follow these simple steps:
1- First step:
Access the settings menu of your Android, it is the gear icon. If you don't see it on the home screen, swipe up from the bottom of the screen and make sure it's there.
2- Second step:
Scroll down the device settings all the way to the bottom where you will see the section called “About phone”, press to continue.
3- Third step:
If you see a section called “Advanced” click to display the advanced options. Otherwise, scroll down until you see “Looking for something else?” and click on Reset
4- Fourth step:
Several options will appear to reset the android device, the first called “Reset settings” resets the default settings, it is a simpler and less deep reset. The method to remove all the content from the device completely is “Factory data reset” click on this option to continue.
5- Fifth step:
A list of all the data that will be removed from device and the applications that will be uninstalled will appear. Scroll down until you find the “Reset” button and press to continue with the process.
6- Sixth step:
If necessary, draw the screen unlock pattern or enter the screen unlock password or PIN to continue.
7- Seventh step:
A second confirmation message will appear indicating that all information stored on the android device and all downloaded applications will be erased and reminding that this action cannot be undone. If you agree, click on “Delete all”.
8- Eighth step:
Your device will restart and take several minutes to start while restoring the device to its factory state and optimizing the pre-installed applications.