In order to hard reset a BenQ-Siemens E81, 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 E81 device will be brought back to the default configuration of a brand new device.
1. For starters, switch your phone on.
2. Next, open up the dialer and type in this code: *#9999#
3. Now your phone will restart.