dfu not booting up

hi everyone
i have flashed dfu to my nrf52832 using the latest sdk 17 i have done all the process as mentioned updating the ecc, private key publickey etc  but my board doesnt do any advertisment the leds turn on dim but tats not the case if i flash a older sdk the leds turn on brightly. 
 

also i had flashed dfu of 15 sdk version and there i could see my board advertising properply please help me out with this 

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