https://devzone.nordicsemi.com/f/nordic-q-a/40274/open-bootloader-always-boots-into-bootloader-modeHi guys, I flashed the mbr hex file and then the open bootloader to a custom nrf52840 board. When i first connect it, it boots into the bootloader mode and i am able to upgrade the firmware using nrfutil. And the new firmware is running. But whenen-USTelligent Community 13Thu, 08 Nov 2018 15:18:07 GMThttps://devzone.nordicsemi.com/thread/156522?ContentTypeID=1Thu, 08 Nov 2018 15:18:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6ae25e1a-b53f-4833-8942-e1fd9f7837b7rgujju<p>Yes! that fixed it. Thank you.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/156509?ContentTypeID=1Thu, 08 Nov 2018 14:16:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c7bbc72a-1edc-4236-b225-b567826471a4Vidar Berg<p>Hi,</p> <p>Please try&nbsp;to set the&nbsp;NRF_BL_DFU_ENTER_METHOD_PINRESET&nbsp; define to &#39;0&#39;&nbsp;in sdk_config.h for the bootloader and see if you get the same result. By the way, it is not necessary to merge the mbr with the app image, nrfutil will omit the MBR when converting the hex to binary.&nbsp;</p><div style="clear:both;"></div>