https://devzone.nordicsemi.com/f/nordic-q-a/39991/unable-to-read-uicr-register-and-flash-the-deviceFollowing error throwing while using nrf tools nrfjprog verion 9.3.1 -------------------------------------------------------------------------------- FUNCTION: open_dll. FUNCTION: open_dll. FUNCTION: enum_emu_snr. FUNCTION: enum_emu_snr. FUNCTION: enum_emu_snren-USTelligent Community 13Wed, 31 Oct 2018 12:49:28 GMThttps://devzone.nordicsemi.com/thread/155330?ContentTypeID=1Wed, 31 Oct 2018 12:49:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c6c504b3-9f13-4a7c-98c4-f4fcf5d4fe3dVidar Berg<p>Hi, the&nbsp;log indicates a problem with the debugger connection. There&nbsp;is number of reasons for why this can happen. Please confirm the target voltage as <a href="https://devzone.nordicsemi.com/members/turboj">Turbo J</a> suggested. Some programmer will only support 3V targets.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/155143?ContentTypeID=1Tue, 30 Oct 2018 13:31:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1fc72fb2-877a-422f-a967-b79bb18f0499Turbo J<p>Try updating your software:</p> <p><pre class="ui-code" data-mode="text">nrfjprog.exe -v nrfjprog version: 9.7.3 JLinkARM.dll version: 6.32h</pre></p> <p>It is also a good idea to check connections and target power.</p><div style="clear:both;"></div>