How to change custom font style in Galaxy J7 MarshMallow 6.0.1

Hello...
i updated my j7 lollipop to marshmallow.
now, it cannot change font style with custom fonts.
i tested with ifont,Hifont,FixFont does not worked.
so, someone please help me :D
how to change custom font style on samsung galaxy marshamllow devices.
thanks !

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