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why the bd_addr auto add 1 when enter the dfu mode,then the dfu failed . thks

1\select zip file

2\scan and select nrf51 dev

3\upload.

then the nrf51 enter dfu mode, and can scan the dfutag ble dev. but the ADDR auto add 1 . Wait about 10 seconds the dfu failed .

4\again select zip file

5\again scan and select dfutag

6\upload and Success .

why ?