Hi, Nordic Semiconductors switches from nrfjprog to nrfutil for new devices.
NRF52840 base boards (pca10056 and pca10059) now use nrfutil as default programming tool. Here is page to get tool: https://www.nordicsemi.com/Products/Development-tools/nRF-Util/Download#infotabs Once nrfutil is downloaded following commands should be executed to complete setup nrfutil upgrade nrfutil install device It is still possible to use JLink/GDB for flashing using target's syscfg.yml with following lines: syscfg.vals: MYNEWT_DOWNLOADER: jlink To use nrfjprog: syscfg.vals: MYNEWT_DOWNLOADER: jprog For PCA10059 (NRF52840 USB dongle DK) it's now possible to flash mynewt project without debugger connection. This applies to the boards that have programmed Nordic SDK bootloader. To use such boards: - install nrfutil - set BSP_NRF_SDK_FLASH_LAYOUT: 1 in target/application syscfg.yml - build application: newt build <target> (no newt create image required, no bootloader target required) - insert dongle DK into USB port, THEN press reset on the board to enter DFU mode (red LED blinks with PWM pattern) - load binary: newt load <target> best regards Jerzy
