nRF52840 Preview DK mbed Bootloaderhttps://devzone.nordicsemi.com/f/nordic-q-a/23545/nrf52840-preview-dk-mbed-bootloaderHi everyone, I went into the bootloader mode with the nRF52840 DK accidentally so I immediately turned off the DK and powered it back on. However, after powering the DK, the LED5 no longer lights up and the DK&#39;s programmer is no longer responsive.en-USTelligent Community 13Mon, 06 Aug 2018 06:43:09 GMTRE: nRF52840 Preview DK mbed Bootloaderhttps://devzone.nordicsemi.com/thread/142938?ContentTypeID=1Mon, 06 Aug 2018 06:43:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:725f0f13-a923-408d-a2a7-812cf8bbb557J&#248;rgen Holmefjord<p>Use the Segger J-Link OB linked by <a href="https://devzone.nordicsemi.com/members/endnode">endnode</a> above, and drag it to the BOOTLOADER drive.</p><div style="clear:both;"></div>RE: nRF52840 Preview DK mbed Bootloaderhttps://devzone.nordicsemi.com/thread/142891?ContentTypeID=1Sat, 04 Aug 2018 00:29:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6f7aa4f5-ebc4-4177-841b-c7a95200edabJavierBluetooth<p>Hello Jay i had these same probleme, how to reflash dlink again, when i restart the device arm with nrf52840 appears bootloader mode, could you drop a binary i could resolved the mistake.&nbsp;</p><div style="clear:both;"></div>RE: nRF52840 Preview DK mbed Bootloaderhttps://devzone.nordicsemi.com/thread/92489?ContentTypeID=1Sat, 15 Jul 2017 21:51:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f6321da6-f9e2-4b9b-abc1-a96f91b8294dJay<p>Perfect, thank you for your help! Issue is resolved :)</p><div style="clear:both;"></div>RE: nRF52840 Preview DK mbed Bootloaderhttps://devzone.nordicsemi.com/thread/92488?ContentTypeID=1Sat, 15 Jul 2017 21:37:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:03913f93-1e58-4a96-980c-437a41f1cdd2endnode<p>There are both <a href="http://www.nordicsemi.com/eng/nordic/Products/nRF52840-Preview-DK/nRF5x-OB-JLink-IF/60180">SEGGER J-Link OB</a> and <a href="http://www.nordicsemi.com/eng/nordic/Products/nRF52840-Preview-DK/nRF5x-OB-mbed-IF/60179">mBed FWs</a> for companion Atmel chip on nRF52840 PDK (and all other Nordic DK boards) in <a href="http://www.nordicsemi.com/eng/Products/nRF52840-Preview-DK">download section of main product page</a>.</p><div style="clear:both;"></div>