https://devzone.nordicsemi.com/f/nordic-q-a/109374/data-is-lost-during-the-dfu-upgrade-how-to-check-which-flash-areas-are-erased-and-operated-during-the-ota-upgrade1. The operation pairing record is stored in the OTA. The Flash pairing record is stored at 0x7d000-0x80000. Where can I see the erased area in the code?en-USTelligent Community 13Mon, 18 Mar 2024 09:24:11 GMThttps://devzone.nordicsemi.com/thread/474233?ContentTypeID=1Mon, 18 Mar 2024 09:24:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:da0ff480-9c6e-446b-ab50-227d4430115ahuangyifeng<p>I saw the link you sent, and I&#39;ve seen these images. But from the source code, which code clearly defines these?<br /><a href="https://blog.csdn.net/YYGY731793898/article/details/108981974">blog.csdn.net/.../108981974</a><br />This link is a parsing of the actual source code, but I still don&#39;t see what parts of falsh it erases.<br /><img style="max-height:240px;max-width:320px;" alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1710753692566v1.png" /></p> <p>This configuration is also correct in my code.</p> <p><img style="max-height:240px;max-width:320px;" alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1710753816130v2.png" /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/474229?ContentTypeID=1Mon, 18 Mar 2024 09:08:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:15f3bfde-a098-48b0-a477-3b08367e0a42Sigurd<p>Hi!</p> <p><span>The memory layout can be found here:&nbsp;<a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_bootloader.html?cp=9_1_3_5_0_7#lib_bootloader_memory">https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_bootloader.html?cp=9_1_3_5_0_7#lib_bootloader_memory</a></span></p> <p><span>To preserve application data during a DFU, configure a value for&nbsp;DFU_APP_DATA_RESERVED&nbsp;in&nbsp;<code>nrf_dfu_types.h</code>. The default value is 3. See this link:&nbsp;<a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_bootloader_dfu_banks.html?cp=9_1_3_5_1_2_2#lib_bootloader_dfu_appdata">https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_bootloader_dfu_banks.html?cp=9_1_3_5_1_2_2#lib_bootloader_dfu_appdata</a></span></p> <p><span></span></p><div style="clear:both;"></div>