Firstly, back-up all your important data to your external storage and also to your google drive.
Switch of your phone first: This is quite very easy and everyone would know how to do this.
Secondly, Press your volume up and your power button: Having done these you would see something like this (This might vary for some phones but most android phones work with this principle)
Then after this, you would continue pressing your volume down and power button until you see this on your computer screen:
After you scroll down (using your volume buttons) to “wipe data/factory reset” and select it (using your Power button)
After this, you wait for a while and expect for it to show you, “data wipe complete!”
Then you scroll back to “Reboot now” and select. Your device will take longer than normal to boot but don’t be worried, its all part of the process.
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