pca10040 cannot be found during keil downloadhttps://devzone.nordicsemi.com/f/nordic-q-a/33119/pca10040-cannot-be-found-during-keil-downloadkeil cannot find the board. It was ok to start with but cannot find the board after erased a few times.en-USTelligent Community 13Mon, 09 Apr 2018 09:39:58 GMTRE: pca10040 cannot be found during keil downloadhttps://devzone.nordicsemi.com/thread/127383?ContentTypeID=1Mon, 09 Apr 2018 09:39:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ee1b2570-9ca7-46cc-8039-3b29fb59d61dBj&#248;rn Kvaale<p>Could you try holding the IF BOOT/RESET button, turn the device off &amp; then on. Then, the board should show up in Bootloader mode (BOOTLOADER) as an external drive. Then, download <a href="https://www.nordicsemi.com/eng/nordic/Products/nRF52-DK/nRF5x-OB-JLink-IF/52275" target="_blank" rel="noopener noreferrer">this file (choose the latest one)</a> &amp; drag &amp; drop it to the BOOTLOADER external drive. Then, if you power cycle the board, it should show up in file explorer again.</p><div style="clear:both;"></div>RE: pca10040 cannot be found during keil downloadhttps://devzone.nordicsemi.com/thread/127313?ContentTypeID=1Sun, 08 Apr 2018 09:40:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5cf1786f-947a-4551-b57f-cadba1602596kanchun<p>Yes, it is win 10 and cannot see the jlink drive.</p> <p>When the board plugged in, it say cannot recognise the USB device.</p><div style="clear:both;"></div>RE: pca10040 cannot be found during keil downloadhttps://devzone.nordicsemi.com/thread/127132?ContentTypeID=1Thu, 05 Apr 2018 17:35:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b11c199b-b28d-4143-9fb7-22e8249d839eBj&#248;rn Kvaale<p>Are you using Windows 10? Can you find the nrf52 dk in file explorer as a JLINK drive?</p><div style="clear:both;"></div>