The Question for ADuC7020 download program

we adopted ADuC7020 and ADM101E for the program download from Keil to ADuC7020.The schematic of circuit as follows:

when we download the program to the chip.we turn BM/P0.0 from high level to low level,as shown from 1 to 2 in Figure.but the software ARMWSD show the follows:

program can not download to chip,and false code are displayed in the panel.

what's wrong with our schematic,can you give me some suggestion,thanks.

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