https://devzone.nordicsemi.com/f/nordic-q-a/23289/unable-to-erase-or-flash-the-softdevice-in-custom-board-using-nrf52dkI have used nrfgo studio, nrfjprog, jlink commander. Whenever i try, it is unable to find the jlinkarm.dll. i have checked the registry, reinstalled everything, but same error. Even soldered the pins on the custom board for connection. here is the nrfjprogen-USTelligent Community 13Mon, 10 Jul 2017 14:40:30 GMThttps://devzone.nordicsemi.com/thread/91559?ContentTypeID=1Mon, 10 Jul 2017 14:40:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3ef2202d-54d0-4e02-acbb-3a8f9884aae2J&#248;rgen Holmefjord<p>You still have not explained which pins you have connected. Are you using P19 or P20 on the nRF52 DK for debug out? Are you able to program the nRF52 DK as normal if not connected to the custom board?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91558?ContentTypeID=1Fri, 07 Jul 2017 04:01:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ddafb154-55bd-4f55-b7fa-384ce2c8ae80ankitjain96<p>uploaded the schematics</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91565?ContentTypeID=1Thu, 06 Jul 2017 11:27:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5b8d76d7-5baf-4bc3-b9e4-4fdbb275a4a7J&#248;rgen Holmefjord<p>Can you provide schematics of the custom board and connections, layout, and picture of the connections/setup?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91564?ContentTypeID=1Thu, 06 Jul 2017 11:23:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d34c401f-d8fd-42fc-964c-9a9bf7d92e76ankitjain96<p>already done. tried on different custom board also. but same thing. none of my boards are getting recognized.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91563?ContentTypeID=1Thu, 06 Jul 2017 11:20:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f69f5597-75da-4e23-a244-06aa75df2ddeJ&#248;rgen Holmefjord<p>Sounds correct. Please verify the supply voltage and connections using multimeter etc.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91560?ContentTypeID=1Thu, 06 Jul 2017 11:05:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1dbe2d9a-e802-451b-8985-f08681d3f7a8ankitjain96<p>gnd connect--&gt;gnd of nrf52dk gnd nrf52dk--&gt;gnd of custom board vtg--&gt;vdd of nrf52 dk vdd--&gt; vdd of custom board sclk--&gt;sclk of custom board swdio--&gt;swdio of custom board</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91557?ContentTypeID=1Thu, 06 Jul 2017 10:50:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:415d57ef-65b3-48ac-a3c4-d23e48a3ba5fJ&#248;rgen Holmefjord<p>How have you connected the debug connections? Which pins on the nRF52DK are going to which pins on the custom board?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91562?ContentTypeID=1Thu, 06 Jul 2017 09:50:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5afce89d-3e13-4e23-908e-269eca611f71ankitjain96<p>I am using the nrf52dk vdd to power the custom board. Also used battery to power the custom board.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91561?ContentTypeID=1Thu, 06 Jul 2017 08:58:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bff2fc87-3579-4dbd-89e0-011ce2d02ddbJ&#248;rgen Holmefjord<p>How do you connect the custom board to the DK? Have you <a href="https://devzone.nordicsemi.com/question/52437/unable-to-find-or-open-jlinkarmdll-while-erase-all/?answer=69625#post-id-69625">powered the external board using 3 V source</a>.</p><div style="clear:both;"></div>