Cannot jump from Bootloader to Application with custom board

[Đào Thanh]

In the case that I used custom board, I used bootloader_secure to OTA; but after OTA, the program doesn't jump to the application, even app nrf connect notify Sent Successfully and still work in DFU mode. 

But when used dev kit, with all the same software condition, it succeeded. After OTA, the program jumps to application and works as expected. 

So, is there any important note about hardware for OTA function? Any idea about my issue.

[Edvin]

Hello,

Have you tested the application without the bootloader on your custom PCB? Does it run as expected?

Can you try the debug bootloader project foun in:

SDK_X.Y.Z\examples\dfu\secure_bootloader\pca10040_ble_debug

And monitor the logging on your custom PCB?

What would you say are the main differences on the custom PCB and the DK? Do you have an external LFXTAL?

Best regards,

Edvin

[Đào Thanh]

I have tested the application standalone, it works well. 

Please make clear about the role of LFXTAL, I have a part of the schematic, see an image below 

Thanks for your help

[Edvin]

Ok. Just wanted to check. The SDK examples are set up to use an external LFXTAL, but it is optional. Just wanted to check if that may be the issue.

Can you try the debug version of the bootloader and monitor the log? What does it say?

BR,

Edvin