https://devzone.nordicsemi.com/f/nordic-q-a/89335/on-linux-update-nrf9160dk-interface-mcu-firmware-stepsHello Devzone, Working on my Ubuntu 20.04 LTS host, I recently lost ability to flash my nRF9160dk board. The embedded J-Link is detected by its serial number, but an attempt to flash Nordic&#39;s at_client sample fails with the following log.log error messagesen-USTelligent Community 13Mon, 27 Jun 2022 13:56:01 GMThttps://devzone.nordicsemi.com/thread/374359?ContentTypeID=1Mon, 27 Jun 2022 13:56:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:41932266-92a9-4d1a-b7d0-9c2eeaee4981Charlie<p>Hi Ted,</p> <p>I have some suggestions for your debugging:</p> <p><span>1) Please make sure you have installed the following software on your ubuntu and try again.</span></p> <p><span><a href="https://www.nordicsemi.com/Products/Development-tools/nrf-command-line-tools/download">nRF Command Line Tools - Downloads - nordicsemi.com</a></span></p> <p><span><a href="https://www.segger.com/downloads/jlink/">SEGGER - The Embedded Experts - Downloads - J-Link / J-Trace</a></span></p> <p>2) Test with another nRF9160 DK board or another PC(Win/Linux/Mac) to confirm which part causes the issue.&nbsp;</p> <p>3) If the nRF9160 DK is&nbsp;<span>the cause, you cannot use the same way as nRF52840DK to program J-Link OB on it. <a href="https://www.segger.com/products/debug-probes/j-link/models/j-link-ob/">J-Link OB Debug Probe</a>((supporting Cortex-M33)&nbsp;on nRF9160DK and nRF5340 is not reprogrammable by the bootloader and can be only updated by J-Link PC software. The log shows your J-Link OB should still be good. </span></p> <p><span></span></p> <p><span>Best regards,</span></p> <p><span>Charlie</span></p><div style="clear:both;"></div>