In order to hard reset a Samsung N105, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Samsung N105 device will be brought back to the default configuration of a brand new device.
1. Switch the phone on.
2. Type this code into the phone, confirm - *2767*3855#
3. Allow your phone to reset and restart.