In order to hard reset a Sony Ericsson Yendo, you should perform the following steps.

Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Sony Ericsson Yendo device will be brought back to the default configuration of a brand new device.


1. Download the PC companion app from Sony Mobile's official website.
2. A window with four options should now open.

3. Hover over Support Zone Now! and select Start.

4. Wait until the installation completes. Afterwards, select Phone / Tablet Software Update and Start.

5. Continue by selecting repair my phone / tablet, accepting through every window that comes your way and preparing computer for software update. 

6. Select the model of your phone.
7. Okay through and follow the on-screen instructions. 
8. Connect your phone to the the PC.
9. Done.