https://devzone.nordicsemi.com/f/nordic-q-a/60050/dfu-over-serial---softdevice-bootloader-application-fails-on-applicationDFU over serial - Application alone - works - Softdevice + bootloader works, but then doesn&#39;t respond to ping when trying to send Application image next nRF52832 Bootloader is: secure_bootloader_uart_mbr_pca10040_debug Application is: ble_app_uart_pca10040_s132en-USTelligent Community 13Sat, 11 Apr 2020 23:39:14 GMThttps://devzone.nordicsemi.com/thread/244249?ContentTypeID=1Sat, 11 Apr 2020 23:39:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c46678f6-2e4a-4010-b011-daacce40ce1eKSV<p>I found the problem was with the debug version of the bootloader. I assume it was too large a footprint.</p> <p>I moved over to the no_debug version of the bootloader and all works very nicely now.</p><div style="clear:both;"></div>