https://devzone.nordicsemi.com/f/nordic-q-a/126965/nrf5340-chip-lockHi I have a urgent production problem about the Nrf5340 chip. In all my pre production, I use nrf5340DK to program my designed board using the jlink through jtag 10pin cable. They have been working for over 2 years. In my recent production, I haveen-USTelligent Community 13Wed, 11 Feb 2026 11:51:22 GMThttps://devzone.nordicsemi.com/thread/560896?ContentTypeID=1Wed, 11 Feb 2026 11:51:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:37e7ca75-a962-47b3-9701-15e949db0c34Simonr<p>Hi</p> <p>Can you share some more details about this issue.</p> <ol> <li>Is this issue occurring on a DK or a custom board that you&#39;re moving into production with?</li> <li>Are you programming the board with an nRF5340 DK or a dedicated J-Link device, if so, which J-Link model, and what voltages does it support and what voltage is the nRF5340 device running on?</li> <li>Do you see this on multiple devices, on some devices out of multiple, or just one device?</li> </ol> <p>Can you try doing an <strong>nrfjprog --eraseall</strong> or <strong>nrfutil device --eraseall</strong> command to see if that gets it out of this locked state?</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>