v15.3 DFU use single bank directlyhttps://devzone.nordicsemi.com/f/nordic-q-a/48364/v15-3-dfu-use-single-bank-directlyNote that for SDK v12.3 : if application size * 2 &gt; available space a single bank update is performed. While I am using v15.3 and there seems no more infor about the single bank and dual bank settings, I want to free more space for data storage anden-USTelligent Community 13Tue, 11 Jun 2019 13:40:23 GMTRE: v15.3 DFU use single bank directlyhttps://devzone.nordicsemi.com/thread/192103?ContentTypeID=1Tue, 11 Jun 2019 13:40:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:20a88801-5ac4-4d80-bacb-a20c66fc4f45Vidar Berg<p>Thanks for answering your question. Just want to add that option two may be better as it will prevent the bootloader from overwriting the app data in case&nbsp;an image is also too big for a single bank update.&nbsp;</p><div style="clear:both;"></div>RE: v15.3 DFU use single bank directlyhttps://devzone.nordicsemi.com/thread/191750?ContentTypeID=1Sun, 09 Jun 2019 17:40:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ff1201a7-4d5b-4120-bc45-593d09318078????<p>solution1: final I find the&nbsp;<a class="el" href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/group__nrf__dfu__validation__config.html#ga8006bfecefff753ae06bbe558451a902">NRF_DFU_SINGLE_BANK_APP_UPDATES</a>&nbsp;in&nbsp;<a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.3.0%2Flib_bootloader_dfu_banks.html&amp;cp=5_1_3_5_1_2">https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.3.0%2Flib_bootloader_dfu_banks.html&amp;cp=5_1_3_5_1_2</a></p> <p>solution2: increase the&nbsp;NRF_DFU_APP_DATA_AREA_SIZE to make the space less than dual bank.</p><div style="clear:both;"></div>