https://devzone.nordicsemi.com/f/nordic-q-a/123360/nrf52840-dk-pca10056-3-0-3-2024-36-not-responding-over-j-link-detected-as-nrf534Hi Nordic team, I recently purchased a new nRF52840 DK with the following label information: PCA10056 Hardware Version: 3.0.3 2024.36 1050218770 I attempted to flash the blinky example using VS Code with nRF Connect SDKen-USTelligent Community 13Thu, 31 Jul 2025 06:33:40 GMThttps://devzone.nordicsemi.com/thread/544170?ContentTypeID=1Thu, 31 Jul 2025 06:33:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0caeb4d2-7752-490c-83a6-f556ec29b54dPaKa<p>So when you programmed the blinky project you did erase the Debugger chip on the board and then the debugger is gone. There is no way to recover the board unfortunately, it&#39;s non-salvageable.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/544128?ContentTypeID=1Wed, 30 Jul 2025 15:41:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ebe484e5-146e-4498-a22f-04293b4d7842Sai<p>Thanks for the clarification. In my case, I actually didn&rsquo;t perform any recovery procedure or attempt to erase the chip. However, the on-board J-Link has stopped responding regardless. I&#39;m unsure what might have caused this, which is why I tried external J-Link</p> <p>Do you happen to have a <code>.hex</code> or <code>.bin</code> image that could be used to restore the debug and UART-to-USB bridge functionality on the board? That might help bring it back to life, if it&#39;s still salvageable. Appreciate any guidance you can offer on this.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/544127?ContentTypeID=1Wed, 30 Jul 2025 15:18:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3460e8cb-38d3-4239-a3fc-e60586050ddfPaKa<p>That is the programming header for the On Board Debugger/SEGGER device, this is indeed a nRF5340.</p> <p>If you erased that device then the board can&#39;t be recovered and the debug and UART to USB bridge is lost forever. You will still be able to program the nRF52840 if you instead use the debug in connector, this is the 20 pin footprint just below where you hooked up. This will require you to solder a 10 pin header to this connector, 20 pin header if you want the TRACE feature instead.</p> <p></p> <p>For future reference, any specific reason for selecting the approach you used to try to recover the board? Want to make sure more people don&#39;t try this.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/544124?ContentTypeID=1Wed, 30 Jul 2025 14:52:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a197b319-a22a-4b4c-89e7-dd80d7338c9eSai<p>Hi Paka,<br /><br />Here is the picture<br /><img style="max-height:240px;max-width:320px;" alt="nRF52840 DK" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/3010.Media.jpg" /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/544122?ContentTypeID=1Wed, 30 Jul 2025 14:44:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d3cdc0ed-4057-4dc6-9583-d96b4293d3f0PaKa<p>Can you attach a picture of the kit and note where you plugged your external debugger in?</p><div style="clear:both;"></div>