STOCK ROM for Alps XS-A891 (Samsung A9 2016 Marshmallow Vietnam Clone)

Good Day!!! i've done everything i could to find a working and compatible Stock Rom for this device but i failed... I'm calling to all of you, my seniors out there maam/sir... kindly please help me with this... thank you very much in advance and more power to all of you...:):):)

BRAND: Alps
MODEL: XS-A891
CPU MODEL: MT6580