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Cannot jump from Bootloader to Application with custom board

In the case that I used custom board, I used bootloader_secure to OTA; but after OTA, the program doesn't jump to the application, even app nrf connect notify Sent Successfully and still work in DFU mode. 

But when used dev kit, with all the same software condition, it succeeded. After OTA, the program jumps to application and works as expected. 

So, is there any important note about hardware for OTA function? Any idea about my issue.

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