Programming a device with a SEGGER J-Link OB Debugger

Nordic Semiconductor DKs contain SEGGER J-Link Onboard (OB) debuggers and are listed with the jlink device trait when connected to the computer through the J-Link USB port.

Note

This is a method valid for devices locally connected to your computer through the J-Link USB port.

For information about programming devices over the network using remote J-Link probes, see Programming a device with a SEGGER J-Link OB Debugger over the network.

You can use the following procedure to program new firmware to the board:

Find the serial number of the J-Link device connected to the system by running the following command:
```
nrfutil device list --traits jlink
```
This serial number of the J-Link device will be referenced as <serial_number> in the next steps.
Delete old firmware on the board by running the following command:
```
nrfutil device erase --serial-number <serial_number>
```
For more information about the erase subcommand, see Erasing the device.
Program the new firmware to the board by running the following command with the correct /path/:
```
nrfutil device program --serial-number <serial_number> --firmware /path/fw.hex
```

Reset the device by running the following command:

nrfutil device reset --serial-number <serial_number>