In order to hard reset a Asus J502, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Asus J502 device will be brought back to the default configuration of a brand new device.
1. Power up the phone.
2. Go to Menu and, when there, find Settings.
3. Next, Restore Factory Settings.
4. Confirm by pressing ok.
5. Use the default passcode, 1122.
6. Your work is done, and hard reset process is complete.