Recently we are purchased nRf51dk and nRfbeacon boards for FOTA function but both boards are not working, we already followed the follwoing links:
1.developer.mbed.org/.../ 2.developer.mbed.org/.../
After driving DFU in master control application showing "connecting" followed by "Starting DFU" and then reset, After it showing the "Default App" instead of FOTA application.