Change directories to
ncs/zephyr/samples/basic/blinky. Then compile as shown before in the compiling section of this guide.
Before you do compile make sure that the following lines are added to the
# Enable Zephyr application to be booted by MCUboot CONFIG_BOOTLOADER_MCUBOOT=y
This will enable support for the bootloader. Then, build using the build command:
west build -b circuitdojo_feather_nrf9160ns
You can see towards the end of this output that both the application and the bootloader have been built and merged.
Programming can be completed with
newtmgr -c serial image upload build/zephyr/app_update.bin newtmgr -c serial reset
Note: pre-built binary can be downloaded here: blinky-v1.3.2.bin