In order to hard reset a Sony Ericsson K610, 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 K610 device will be brought back to the default configuration of a brand new device.
1. Start by installing the PC Suite.
2. Now go to Tools > Phone repair.
3. Continue the installation process by following the on-screen instructions.
4. Hard reset will be over when the PC Suite is installed.