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DFU without interface MCU

Hello Nordic community,

I have a question about implementing DFU on the custom board. By looking at NRF52 DK and reading explanation in Nordic infocenter, I can see that button 5 (IF BOOT/RESET) is connected to the interface MCU for entering bootloader mode. For my application, I would like to have bootloader and DFU function without having extra interface MCU. I would like to ask here how I can do that.

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