nRf51 dk FOTA is not working

[ripit]

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.

[MartinBL]

You are using the initial image for the nRF51 DK platform found here, right? What SDK and example are you using? The image file in the link installs a bootloader and Softdevice 7.1.0 to your board which means that you will have to use SDK 6.1.0 or SDK 7.x.x as specified in the Compatibility matrix.

I have tried the steps in your previous link using the image file in the link, SDK 7.2.0, and the example \pca10028\experimental_s110_with_dfu and that works. I don't use the init file either. I have tried both nRF Toolbox and Master control panel for Android. Have you tried refreshing the list of discovered devices?

EDIT: By the way: it is also good practice to enable the Service Changed Characteristic when using DFU.