In order to hard reset a BenQ C30, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
BenQ C30 device will be brought back to the default configuration of a brand new device.
1. Make sure that the device is powered on.
2. Enter Standby screen and type in the *#9999# code. Press Call button.
3. Cellphone will now restart. Done.