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From this link follow steps (Null modem cable only without Network lan) and flash original bootloader
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But you should to choose LD2 (For Genuine sim and A8P) and this loader not free must be make donation to get pro key then you can use LD2....
Or otherwise use dreamup or see this video
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P.s: Your box 800se so Should be use both cable to gather (mini usb + Lan ) cables and flash original secondstage (bootloader)