In order to hard reset a Sendo J520, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Sendo J520 device will be brought back to the default configuration of a brand new device.
1. Hello. Begin by turning off the phone.
2. Continue by plugging in the phone charger.
3. Next, press and hold the Power & 5 buttons at the same time. Release them after a green tick appears on-screen.
4. Lastly, press Left Soft Key and wait until the phone resets and restats. Voila.