https://devzone.nordicsemi.com/f/nordic-q-a/128471/i-can-t-recover-nrf52820-dongle-firmwareHello, my name is William. I made new Lenovo wireless keyboard dongle firmware using nrf52820 and wrote it to dongle. But at first I connected device using J-link version9.5 and NRF-command-line-tool 10.7. Next I disconnected it and tried to connect againen-USTelligent Community 13Tue, 16 Jun 2026 12:20:11 GMThttps://devzone.nordicsemi.com/thread/567986?ContentTypeID=1Tue, 16 Jun 2026 12:20:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:40482027-2709-4ecd-8d84-66b65df0b5b8Priyanka<p>Hi William,</p> <p>Please update to the latest J-Linkversion&nbsp;and use nRF Util instead of the legacy nRF Command Line Tools.</p> <p>Most likely it might be a readback protection issue. Please try the following:</p> <ol> <li> <div><span>Download<span>&nbsp;</span><a href="https://docs.nordicsemi.com/bundle/nrfutil/page/README.html" rel="noopener noreferrer" target="_blank">nRF Util</a>.</span></div> </li> <li> <div><span>Install the<span>&nbsp;</span><code dir="ltr">nrfutil device</code><span>&nbsp;</span>command.</span></div> </li> <li> <div><span>Connect the dongle.</span></div> </li> <li> <div><span>Run:</span> <div> <div><code><span>nrfutil device recover</span></code></div> </div> </div> </li> <li> <div><span>Disconnect and reconnect the dongle.</span></div> </li> </ol> <p><span>-Priyanka</span></p><div style="clear:both;"></div>