In order to hard reset a Fly SX210, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Fly SX210 device will be brought back to the default configuration of a brand new device.
1. Make sure that the smartphone is turned on.
2. Tap in the *#987*99# code. Press Send.
3. Wait for the smartphone to restart.