In order to hard reset a Elson SL900a, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Elson SL900a device will be brought back to the default configuration of a brand new device.
1. Switch off the smartphone by pressing and holding the Power button.
2. Display Menu by pressing the Left Soft Key.
3. When there, go to Settings, Security Settings and Factory Settings.
4. Confirm the Restore factory default option by tapping Enter.
5. Begin the hard reset process by tapping in the security code 1234.