In order to hard reset a Motorola A810, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Motorola A810 device will be brought back to the default configuration of a brand new device.
1. Power up the phone.
2. Now open Menu, enter Setup and Master Reset.
3. Well done, the hard reset process is complete.