B??c 2: Trong m?c ??ng nh?p s??có mã QR dành cho Android ho?c là h??IOS ???ng??i ch?i có th??l?a ch?n mã phù h?p v?i h???i?u hành c?a ?i?n tho?iThe useful resource cannot be observed. Description: HTTP 404. The useful resource you are trying to find (or amongst its dependencies) could have been removed, experienced its identify improved, or