In order to hard reset a Fly DS159, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Fly DS159 device will be brought back to the default configuration of a brand new device.
1. Turn on your smartphone.
2. Now tap in this code, *#987*99#, and press Send button.
3. Wait for your smartphone to restart. Done.