In order to hard reset a Samsung D820, you should perform the following steps.

Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Samsung D820 device will be brought back to the default configuration of a brand new device.


1. First of all, press-hold the Power button.

2. Enter the *2767*3855# code into the phone. Press Call button to confirm.
3. Wait for your device to reset & restart. That is all.