Can't remove the pattern security in Android

[TheRom]

Hi,



I have an S6 with verrsion 6.0.1.



My issue is that I can't turn off the pattern security. I normally just use the pin, but I decided to use the pattern instead. Unfortunatly I kept getting the pattern wrong, that wasn't a major issue as I used the master pin instead to get into the phone.



The issue is that I can't turn the pattern off and go back to the pin.



When I go into Settings- Lock screen and security- Screen lock type. It wants me to put the pattern in first! I have tried putting in the pattern over 20 times and it just wants me to carry on trying



What can I do to go back to just using the pin, when I have the masterpin.



Any help greatly received......



Cheers,



Craig