You may need to power cycle the device into a safe (read-only) image, if you cannot see your NI USRP-29xx device in the NI-USRP Configuration Utility and are unable to reset the IP address. When you have done this, it will reset the device's IP to the default value of 192.168.10.2. For step-by-step instructions, you can see the
Why Doesn't the Device IP Address Reset to the Default? section located in your
NI USRP 2920/2921/2922 Getting Started Guide.