Application does not start after DFU update

[Sourabh]

Hi, I've combined the secure serial and ble bootloader and using it for my custom board. I tried flashing my application hex over serial using nrfutil. I get a device programmed 100% message but my application is not starting. Is there a issue with my iram and irom settings? Following are my target settings for application and bootloader:

Application settings

IROM1

Start: 0x23000

Size: 0x5D000

IRAM1

Start: 0x20002A68

Size: 0x10000

Bootloader Settings

IROM1 Start:0x73000

Size: 0xB000

IRAM1 Start: 0x20002C00

Size:0xDE80

I'm using softdevice v5.0.0 and sdk14.0.0 for my application and bootloader.

[shibshab]

There is a known issue with sdk 14.0.0 where performing DFU which contains a softdevice of different size than the old one will not work. Is this the case?

[Sourabh]

I’m not updating the softdevice. I just update my application. Initially I flash s132 v5.0.0 then flash my bootloader. I then try to load my application using serial DFU. I get programmed 100% but application does not start.

[shibshab]

Have you loaded the bootloader settings page generated for that specific application?

nrfutil pkg generate something somethnig my_settings.hex

and then you flash that hex file before doing the application update.

[Sourabh]

I generate a dfu package using the nrfutil, I observe that the application starts but stops after few seconds.

[Hung Bui]

So actually the application started? You need to debug the application and see where it crashes. Debug it as normal, just start debugging and then let the bootloader running you should get to application's main after the bootloader starts and switch to application.