In order to hard reset a Haier A7, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Haier A7 device will be brought back to the default configuration of a brand new device.
1. Turn on the phone.
2. Enter Settings and select Restore factory settings.
3. Unless something is very wrong, your phone will now reset and restart. Done!