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My Program Won't Run When Downloaded to nRF52840 Preview DK

I'm using the nRF52840 Preview DK board.

nRF5 SDK for Thread and Zigbee v2.0.0 (Release Date: Week 39, 2018)

Segger Embedded Studio for ARM V3.52

I can run the zigbee_dynamic_light_switch_nus_pca10056_s140.emProject in the SES development environment. Then when I download this program to the nRF52840 board it continues to run just fine.

However, my project (note: I used the zigbee_dynamic_light_switch_nus_pca10056_s140.emProject as a starting point for my project) runs just fine in SES, however when I download it to the nRF52840 board, it does not run. I've checked the RAM_START and FLASH_START values, I've followed the instructions in this link (https://devzone.nordicsemi.com/tutorials/b/getting-started/posts/adjustment-of-ram-and-flash-memory), but nothing I do allows my project to run on the nRF52840 preview DK board unless I am using the J-Link attached to Segger Embedded Studios.

Any help is appreciated.

John

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