I would say that box comes with a one off image, its called define OS you buy it for its features, you would not buy it and then try to use it for another purpose. The box one should get is the one with DUAL BOOT on the label. Send it back and say you made a mistake.
This is your one Octagon SX88 SE V2 WL HD S2+
and this is the one OCTAGON SX88 V2 4K UHD S2+IP 5G Wi-Fi 1xDVB-S2 Enigma 2 DUAL OS Linux Smart TV Sat Receiver but side by side they look almost identical except for the logo dual boot.