https://devzone.nordicsemi.com/f/nordic-q-a/15531/protect-peer-manager-encryption-keys-from-dfuI have an application that bonds to mobile devices and encrypts the connection on both Android and iOS. What I am noticing though, is that after each time I use the DFU to update the application, all the encryption keys are lost. On Android, this isnen-USTelligent Community 13Mon, 08 Aug 2016 11:26:03 GMThttps://devzone.nordicsemi.com/thread/59308?ContentTypeID=1Mon, 08 Aug 2016 11:26:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a3215a89-9a9c-4c3c-af02-4b6d0588c868bjorn-spockeli<p>You can configure the bootloader to retain the bonding information, i.e. not erase the flash pages where it is stored, by setting the <code>DFU_APP_DATA_RESERVED</code> in <code>dfu_types.h</code> to the required number of bytes, see <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v11.0.0/bledfu_memory_appdata.html?resultof=%22%72%65%74%61%69%6e%22%20%22%62%6f%6e%64%69%6e%67%22%20%22%62%6f%6e%64%22%20">this</a> Infocenter page.</p> <p>-Bjørn</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/59307?ContentTypeID=1Thu, 04 Aug 2016 06:53:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ba3117aa-1d13-4444-95ec-b6ab113a257dshibshab<p>Using the &quot;fds&quot; module which again utilizes the &quot;fstorage&quot; module in the nRF5 SDK (from version 11) you can store data in flash.</p> <p>Once this data is stored in flash you need to ensure that the bootloader does not use/erase/overwrite the flash pages where you have stored the encryption keys when performing a DFU.</p> <p>As far as I can remember you can do this by modifying the file &quot;pstorage_platform.h&quot; to not use the same address space as the &quot;fstorage&quot; module.</p><div style="clear:both;"></div>