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So read this topic and Follow "Null modem cable only without Network lan" method
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1-select com (If doesn't connect try to change Baudrate between 57600 & 115200)
2-select Loader [LD1] For sim2
3-click settings and choose "sectors recover"
4-select [Repair No Ca Found] and choose DM800se-sim2.10-ssl84b
5-click "Do job" and turn on power to box and wait to connect with box and repair the problem.
6-If box boot again then flash new image for DM800se-sim210 from here
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or if your box (DM800-SE For Sunray4/SR4) here
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P.s:Must be connect pc with box by both cables (Lan & mini usb)
If doesn't connect then try another pc (better xp win) and another cable