ds-2cd1341-i

Hello, I bought some of these HikVision cameras DS-2CD1041-I, and DS-2CD1341-I but I can't seem to find any firmware updates on HikVision's website. Actually I can't even find the products on HikVision's website. Some of the cameras come with firmware v5.4.5_170124 and others have v5.5.5_180111...