In order to hard reset a BenQ-Siemens 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-Siemens EL71 device will be brought back to the default configuration of a brand new device.
1. Turn your phone on.
2. Type the following code *#9999#
3. The phone should now restart.