https://devzone.nordicsemi.com/f/nordic-q-a/38720/the-update-risk-preventive-methodHi, we are using SoC nrf52810 SDKv14.2-SR3v1.2 for our RCU. 1.If there is a scenario the image transfer is finished, and the power lost happens when the old image is being replaced : If BL update: Will the whole boot loader crash and the RCU becomeen-USTelligent Community 13Thu, 20 Sep 2018 14:12:41 GMThttps://devzone.nordicsemi.com/thread/149670?ContentTypeID=1Thu, 20 Sep 2018 14:12:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bba3e59c-6bc5-4b85-853d-a73e08f4e1beJ&#248;rgen Holmefjord<p>Hi,</p> <p>Please see the last section (Support for nRF52810) of SR3 firmware v1.2 documentation:&nbsp;<a title="DFU - before you start" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sr3nrf52.firmware/dfu_remarks.html?cp=9_3_1_3_1_0">DFU - before you start</a>:</p> <p style="padding-left:30px;"><em>The Smart Remote bootloader adds modifications required to run it on the nRF52810 SoC.</em></p> <p style="padding-left:30px;"><em>Due to smaller flash and RAM area available on nRF52810, there are significant configuration differences for the bootloader targeting nRF52832 and nRF52810. <strong>On nRF52810, it is not possible to update the bootloader or the SoftDevice (only the application can be updated).</strong> When the application is downloaded, the old application is always deleted (the in-place application update model is used).</em></p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>