Fortigate Firewall 60F Reset issue

[mfcitsupport]

Dear All, 

I am trying to reset fortigate 60F because i forget the password and using reset pin to reset but cannot can any one tell me easy way how to reset fortigate using reset button without console. 

[plsikk]

I did reset may times just pressing button and botting via power. Keep pressed maybe 15 sec.