In order to hard reset a BenQ EL71, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
BenQ EL71 device will be brought back to the default configuration of a brand new device.
1. Turn on your phone.
2. Type this code in: *#9999# and press the Call button.
3. Your phone will restart. Done.