OTA from android app not working

Question

Hello, 
 I am trying to flash an application onto nRF8122 from an android mobile using the Nordic app. After pressing the DFU button, the programming fails giving a pop as DFU service not available.
I tried to perform the firmware update using the bluetooth dongle (PCA1000) and it worked fine.
The same .hex file used to program using the Nordic app is giving an error.
Is there something that I am missing?
Should I merge softdevice hex and application hex when I program from the android app?
Could you please help me out in figuring the problem? 
 SDK: 6.1.0
S110: 7.1.0 
 I am using the bootloader code provided by Nordic in the following path:
Nordic
rf51822\Board
rf6310\device_firmware_updates\bootloader 
 Thanks!

Stian Røed Hafskjold · Accepted Answer

You wrote: 
 
 I continued to debug and below are the
results: 1. I tried with Android 4.4.4
and I am able to successfully update
the firmware 2. Firmware used:
ble_app_hrs_s110_v7_0_0.hex that is
available along with the installation
of Nordic App from play store 3. How
ever with other Android versions
(4.4.2) I am not able to upgrade the
firmware. 4. Android version used in
all mobiles I have tested so far:
1.11.3 5. With nexus 5 and Android 5 sometimes the firmware upgrade is
successful but the status/ progress
bar in the UI o Nordic is not showing
the same. 
 Can you tell me the limitations of the
Nordic android App? compatible
versions and so on? 
 
 It has been tested on Nexus 4,5,7 with Android 4.4.4 and 5. 
 It should also work on Android 4.4.2 with a Samsung Note II and Android 4.3 with Samsung S3. 
 All Android versions so far have Bluetooth issues, and several phone models have different issues. 
 So, the conclusion is that it should work on Android version 4.3 and above, but 4.3 had a lot of bugs that were fixed in later versions, so the higher the Android version the better.

OTA from android app not working

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