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Read this topic and Follow "Fix Bad Sector "Null modem cable only without Network lan"
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 DM800-sim2.01-ssl84b
5-click "Do job" and turn on power to box then wait to connect with box and repair the problem.
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 DM800-sim2.01-ssl84b
5-click "Do job" and turn on power to box then wait to connect with box and repair the problem.