Tecno F1 Screen Lock Reset Without Data Loss

Hi Everybody, I got Tecno F1 Onhand With Forgoten Pattern And I Want To Unlock It Without Touching Userdata. The Phone Is From Police So userdat Are Highly Needed. Anyone Has Tried Unlocking It With Eft?? Or Eft Supporters Can You Give Me Assirance Wether Its Possible or Not.
Thanks In Advance