https://devzone.nordicsemi.com/f/nordic-q-a/73454/programming-custom-nrf52-board-using-j-linkWhen I try to program custom NRF52 board using a J-Link v9 (It&#39;s probably a copy product), I&#39;m getting the error below. I also have several NRF52/NRF53 DK boards when I try using their debug-out for programming, there is no problem. When I use J-Flashen-USTelligent Community 13Tue, 06 Apr 2021 13:12:59 GMThttps://devzone.nordicsemi.com/thread/303173?ContentTypeID=1Tue, 06 Apr 2021 13:12:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7529fc22-09f0-4bbe-8abe-ec786b45fec2Susheel Nuguru<p>It is very possible that the nrfjprog performs some initial checks on the factory settings and attempts to connect to it in a bit different way based on the build code and product version. Segger might not perform this checks and just tries to connect which might be working luckily.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/303009?ContentTypeID=1Tue, 06 Apr 2021 06:37:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:91d49d14-a5fd-4cad-9c03-599ea2da5a3dnuppo<p>I bought it from a local store so it&#39;s most likely a copy. But I wonder how this works with Segger&#39;s J-Flash utility not with nrfjprog.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/302940?ContentTypeID=1Sun, 04 Apr 2021 15:47:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c2dd1724-238c-46ad-9e79-b6107da91f69Susheel Nuguru<p>it seems like the nrfjrpog is not able to see few values related to the product build in the registers at connect time. This can happen like you suspected if this is a copy product or if the device memory has been corrupted. Where do you buy the product?&nbsp;</p><div style="clear:both;"></div>