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Hello, I have some problem about nrf52_sdk_v14.2 bootloader

I make a pcb with nrf52832, DCDC-mode,  but when I run bootloader_secure_ble in that, I found a confused question. When I power-off my board, then power-on it, the bootloader dosen't run. There is no advertising. And then I connected my board to Jlink-RTT-Viewer, it's okay to run.  I don't know why. 

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