In order to use this source code install nRF Connect and then install the "Toolcahin Manager" From the "Toolchain Manager" install v1.4.99-dev1, this should create a folder structure in the following location, if you are on MacOS, not sure about other platforms... /opt/nordic/ncs/v1.4.99-dev1 You need to use the "Toolchain Manager" to enter the command prompt with the correct environment settings. This is from the drop down arrow next to the v1.4.99-dev1. Drop down the menu and choose "Open Terminal" to enter the build environment. Place the folders in this zip file in the following folder... /opt/nordic/ncs/v1.4.99-dev1/nrf/applications Use these commands to build the application... cd /opt/nordic/ncs/v1.4.99-dev1/nrf/applications/serial_lte_modem_actinius_icarus_115200 west build -b actinius_icarus_ns -p cd /opt/nordic/ncs/v1.4.99-dev1/nrf/applications/serial_lte_modem_actinius_icarus_921600 west build -b actinius_icarus_ns -p cd /opt/nordic/ncs/v1.4.99-dev1/nrf/applications/serial_lte_modem_circuitdojo_feather_nrf9160_115200 west build -b circuitdojo_feather_nrf9160ns -p cd /opt/nordic/ncs/v1.4.99-dev1/nrf/applications/serial_lte_modem_circuitdojo_feather_nrf9160_921600 west build -b circuitdojo_feather_nrf9160ns -p cd /opt/nordic/ncs/v1.4.99-dev1/nrf/applications/serial_lte_modem_nrf9160dk_115200 west build -b nrf9160dk_nrf9160ns -p *** DON'T FORGET to change the nRF52/nRF91 switch to nRF91 to program the nRF9160 cd /opt/nordic/ncs/v1.4.99-dev1/nrf/applications/serial_lte_modem_nrf9160dk_921600 west build -b nrf9160dk_nrf9160ns -p *** DON'T FORGET to change the nRF52/nRF91 switch to nRF91 to program the nRF9160 *** if the nRF9160 baseband needs updating, follow directions in the baseband folder to program the board controller for the nRF9160DK (the nRF52840) *** DON'T FORGET to change the nRF52/nRF91 switch to nRF52 to program the nRF52840 nrfjprog -f NRF52 --program nRF9160_DK_board_controller_FW.hex --sectorerase to program, change to the correct folder above and use this command if using nrfjprog nrfjprog -f NRF91 --program build/zephyr/merged.hex --sectorerase