https://devzone.nordicsemi.com/f/nordic-q-a/42716/mbr-settings-dfu-settings-backupCurrently in memory map nRF5 SDK 15.2 (which apparently is a base for Thread SDK) says for nrf52840: Bootloader settings 0x000F F000 - 0x0010 0000 (4 kB) MBR parameter storage 0x000F E000 - 0x000F F000 (4 kB) However, the exampleen-USTelligent Community 13Tue, 22 Jan 2019 12:50:53 GMThttps://devzone.nordicsemi.com/thread/167088?ContentTypeID=1Tue, 22 Jan 2019 12:50:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7fe4a3ac-3af4-4702-ab25-e28dc69bbb9fVidar Berg<p>Hi,</p> <p>The MBR store parameters (progress, source pointer, etc) to the params page during bootloader copying (ie DFU of the bootloader itself) to ensure that the copy routine can withstand any unexpected resets. Since the params page is only used in the final step of a bootloader update it is ok to also use it as a backup page.&nbsp;</p> <p>The source code for the MBR is not available unfortunately.</p><div style="clear:both;"></div>