Preserving application data with growing bootloaderhttps://devzone.nordicsemi.com/f/nordic-q-a/20713/preserving-application-data-with-growing-bootloaderApplication data is stored just before the bootloader. If I do a DFU upgrade with a larger bootloader than the one currently flashed, is this taken care of? That is, is the application data copied to the area just before the new bootloader? I&#39;ve readen-USTelligent Community 13Thu, 23 Mar 2017 11:23:08 GMTRE: Preserving application data with growing bootloaderhttps://devzone.nordicsemi.com/thread/80828?ContentTypeID=1Thu, 23 Mar 2017 11:23:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:00492f5d-3607-4bc9-ae6c-982fdadf99edHung Bui<p>Hi Jacob,</p> <p>Enlarging the size of the bootloader is not really supported with our bootloader, at least not out of the box.</p> <p>The reason for that is the address of the bootloader is written in UICR. It&#39;s possible to erase the UICR and write new address to it but this is not handled by the current bootloader. (on nRF51 it was not possible to erase UICR).</p> <p>Therefore reserving the data when enlarging the bootloader is also not handled with our current bootloader.</p> <p>My suggestion is to reserve enough space for the bootloader so that you don&#39;t have to move the bootloader address down in flash when you enlarging it in the future.</p><div style="clear:both;"></div>