https://devzone.nordicsemi.com/f/nordic-q-a/126251/target-connect-jlink-issue-in-segger-embedded-studioI am using SEGGER Embedded Studio v8.26 with J-Link software v8.94 on Windows (64-bit) for BLE development on the nRF52840 DK . Using J-Link Commander , I am able to: Detect the nRF52840 DK Successfully program and run firmware on the boarden-USTelligent Community 13Tue, 23 Dec 2025 07:41:24 GMThttps://devzone.nordicsemi.com/thread/557559?ContentTypeID=1Tue, 23 Dec 2025 07:41:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:550b2342-427e-4c7d-b6e2-21649f383b3epraveen.r<p>Thank you for the support. After downgrading <strong data-start="150" data-end="193">SEGGER Embedded Studio to version v5.44</strong>, I am now able to successfully connect to the <strong data-start="240" data-end="250">J-Link</strong>, flash the firmware, and run the code on the <strong data-start="296" data-end="311">nRF52840 DK</strong> without any issues.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/557524?ContentTypeID=1Mon, 22 Dec 2025 13:05:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e74ee627-546b-464b-a6e2-e8721b93f38eVidar Berg<p>Hello,</p> <p>It may not be directly related to the issue, but the nRF5 SDK is not compatible with segger&nbsp;embedded&nbsp;studio (SES) version 6 and above, so the first step I would recommend is to install SES v5. Also check if you have other versions of jlink installed (32 or 64 bit).</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>