You can program the nRF91 Series DK firmware application and network core firmware over USB.
You can follow this procedure to update the firmware on nRF91 Series DKs using the latest application and modem firmware from the from the Nordic Semiconductor website:
See the CONTENTS.txt in the downloaded ZIP archive for the description of the firmware files and their usage.
To program the nRF91 Series DK, you will also need the following USB cables:
- nRF91x1 DK - USB-C cable
- nRF9160 DK - micro-USB cable
Tip
If you experience any problems during the process, press Ctrl+R (command+R on macOS) to restart the Programmer app and try again.