https://devzone.nordicsemi.com/f/nordic-q-a/46752/how-does-mbr-know-of-the-bootloader-s-start-address-when-sd-is-absentI am planning to use Open bootloader example as my starting point for adding a bootloader to an application. I donot want Softdevice. Initially I am going to check the dfu functionality once I get this right. Below are the steps I am planning to followen-USTelligent Community 13Fri, 03 May 2019 09:11:23 GMThttps://devzone.nordicsemi.com/thread/185104?ContentTypeID=1Fri, 03 May 2019 09:11:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f30a29f7-b5ee-442f-81ec-a33d47d7e56eAadishri GS[quote userid="4240" url="~/f/nordic-q-a/46752/how-does-mbr-know-of-the-bootloader-s-start-address-when-sd-is-absent/184891"]This can happen if you press the reset button while power-cycling the board. It only affects the interface MCU(jlink lite), not the nRF chip.[/quote] <p>This was a very important point. Thanks very much!!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/184891?ContentTypeID=1Thu, 02 May 2019 12:24:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8221476d-2080-402f-a018-5c433c4a51fbVidar Berg<p>Hi,</p> <p>I would recommend using the standalone version of the MBR is included in the SDK 15.3.0:&nbsp;\nRF5_SDK_15.3.0_59ac345\components\softdevice\mbr\nrf52840\hex&nbsp;</p> <p>1. Yes, the bootloader address is either stored in the UICR (@0x10001014) or in the MBR at&nbsp;MBR_BOOTLOADER_ADDR if you use the bootloader from SDK 15.3.0</p> <p>2. Yes, the open bootloader changes the interrupt forwarding before booting the app.</p> [quote user=""]Caveat: My device lost the JLink bin used for JLink debugger when I earlier used the nrf_go studio.[/quote] <p>&nbsp;This can happen if you press the reset button while power-cycling the board. It only affects the interface MCU(jlink lite), not the nRF chip.&nbsp;&nbsp;</p><div style="clear:both;"></div>