Help "Unupdatable " Asus Zenfone 5


Got scammed by Efox-shop. Sent me a normally not updatable ,built for China phone ,with a forced up ww OS. Will not take OTA or SKU update.
Could anybody help through Team Viewer Quick Support to ADB command the updates? In Hungary the Asus is not supported by service yet and I am completely novice and TOO OLD to work with command lines. PLEASE!