Thingy52 always run to DFU when power on.

Hi, 

   I encounter a issue with my printed broad that mainly copy the thingy52.  I download the thingyv210HW10.hex into my hardware. And then I debug the code (thingysdkv210) which downloaded form your network.  but it can not be debugged , it run into the bootloader DFU, at this time I can scan my device with the nRF Connect , it shows "ThingyDfu".  Does any body have the problem? please help me out. Thank u.  My device also has the LEDs, they breathe in green color.  

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