https://devzone.nordicsemi.com/f/nordic-q-a/18135/bootloader-and-sd-dfuAfter reading the FAQ on DFU I still do not understand how the bootloader and SD DFU are performed so that a failure during the upgrade does not brick the device (see answer A, bullets 3 and 4). My initial guess is that bootloader and SD are smallen-USTelligent Community 13Mon, 05 Dec 2016 10:50:50 GMThttps://devzone.nordicsemi.com/thread/69972?ContentTypeID=1Mon, 05 Dec 2016 10:50:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c7cdd0a8-268e-49a9-8029-8b8b26c5880agenis<p>Ok I missed that when I read it. Thanks!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/69971?ContentTypeID=1Mon, 05 Dec 2016 08:43:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e3a975cd-5761-4538-8062-e84d078319f8bjorn-spockeli<p>Hi Genis,</p> <p>you are partially correct, nothing is stored in RAM, but Bootloader and SoftDevice updates are always performed with dual-bank DFU. The application will be erased prior to a SoftDevice + Bootloader update to make room for the image and you will have to update the application after the SD+BL update. This is shown on <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v11.0.0/bledfu_memory_banks.html">this</a> infocenter page.</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>