Hard Reset SAMSUNG G910S Galaxy Round

First method:

1. Power on the phone.
   
2. Then tap code: *2767*3855#.
3. Now wait until your phone will reset and reboots.

Second method:

1. Make sure, that your device is on.
2. Then goto Menu -> Settings -> Backup and reset -> Factory data reset -> Reset phone ->Erase everything.
3. After that your cell phone will reset and restarts.

Third method:

1. First you must turn off the phone.
   
2. When your phone is switched off, press together Volume Up + Home button + Power button
   
3. If you see the menu in your screen, scroll with Volume buttons "wipe data/factory reset" and select with Power button.
   
4. Next confirm the operation by Power button.
   
   
5. Then in the menu select "reboot".
   
6. Now wait until phone restarts.
7. When your phone restarts you will see standard configuration like when you first start phone.
8. Success!!!

WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.