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Bootloader hex file cannot download in the NRF52833 DK board

Hi,i use  the bootloader demo code ,the file path is nRF5_SDK_16.0.0_98a08e2\examples\dfu\secure_bootloader\pca10056_s140_ble\arm5_no_packs ,after I compiled and passed, I used NRF connect to program the hex file,my steps are as follows:

tool: NRF52833 DK        nrf connect

SDK:  nRF5_SDK_16.0.0_98a08e2

First, I used NRF connect to load the file bootloader.hex and s140_nrf52_7.0.1_softdevice.hex,and the nrf connect tool prompt “some of the HEX files have overlapping data”, i want to ask what is this?

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