You can find a useful guide regarding activation of a Cardlink Android POS in a video or a PDF format below, according to your model.
A80 Ethernet/WiFi: Video | PDF
A920 Pro WiFi/4G: PDF
A920 WiFi/4G: Video | PDF
A77: PDF
A50: PDF
A910: Video | PDF
D188 Mobile: PDF
D200 Mobile: Video | PDF