Buttonless DFU with bonds, issue on Galaxy s8 phone

Question

We are working on a project, with a working secure buttonless bootloader that works flawlessly. However I recently made it with bonds, and it works with all of the devices I've tested both OS and android, except my Galaxy S8. Upon issuing the enter bootloader command, the device enters bootloader mode and advertises the bootloader fine. However when I connect my Galaxy S8 to the device, I notice it contains all the characteristics and services of the app on the firmware, not the bootloader, and pressing the DFU button on NRF Connect and attempting an update via zip will fail. Attempting with a newer android phone, android tablet, and OS phone works fine, upon connecting with the bootloader the NRF connect app displays all the bootloader services and characteristics instead of the device apps. Do you have any idea what may be the issue with my Galaxy S8? I have attempted reinstalling the NRF Connect app with no success. 
 Thanks, 
 Steven

Steven Yan · Answer

Hi Vidar, thanks for the response. 
 It appears it is related to the indication, as if I select the indication button for service changed on NRF connect during application mode, before i enter DFU, everything works as expected on my Galaxy S8. So from my understanding, the app is supposed to set indication for service changed at some point, but it is failing on my phone? Is there a way to code to make it indicate at some point, perhaps after connection, in case it fails? 
 My current tools at my disposal is our custom pcb and an nRF52 DK, with which I used Segger IDE to debug. I am unsure how I can check for the error code returned by the service_changed_send() function, as I believe you cannot debug the DK with both app and bootloader on it? Unless I am mistaken? 
 Thanks, 
 Steven

Buttonless DFU with bonds, issue on Galaxy s8 phone

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