Failed to RXD?

hi mates
i have spreadTrum D10 phone...when i try to intend aggregation ..that is gift error>>>>>>
Initializing...
DA_LIB_VER_3.3.4.1
It is sensing the pinout fast...
D-=8 D+=6
Searching commport...please wait...
Connecting...
Spd USB-to-Serial=COM15
Connected...sending boot...
Failed to RXD

please support me how can i resolved my problem........

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