https://devzone.nordicsemi.com/f/nordic-q-a/32611/nrf52840-preview-dk-shows-no-jlink-folder-when-connected-to-a-pcI have connected the board to a PC and it prompted a JLINK folder when connected to a PC. However, when I tried an example project on the IAR workbench, I think I clicked the debug button and flash the code to nRF52840-preview-DK. After that, when I connecten-USTelligent Community 13Thu, 22 Mar 2018 12:23:14 GMThttps://devzone.nordicsemi.com/thread/125523?ContentTypeID=1Thu, 22 Mar 2018 12:23:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d64ad03c-ef0e-4534-bc08-1d8d4a408c62jyang<p>It seems that when I put a bin file to the bootloader folder, it removed the J-LINK OB. I downloaded a J-LINK OB bin file and put it into the bootloader folder. I can see JLINK folder now.</p><div style="clear:both;"></div>