Unable to upload program on board after upgrading to SDK15.3

[StephaneJ]

Hi,

We have a working solution on the SDK15.0.0 with a custom board based on nrf52832 s132. I'm using the nrf52dk PCA10040 to program my boards. For this board we use a buttonless version of the bootloader based on the example : examples/dfu/secure_bootloader/pca10040_ble/

Recently we have updated to SDK15.3.0, now the firmware is compiling well on this version. I was able to built the same bootloader version from the example folder. I flash the bootloader into my board, I see the DfuTarg, but when I upload my firmware using the nRF Connect app nothing happens, the board stay in DfuTarg mode.

When I upload the bootloader compiled with the SDK15.0.0 in my board then upload the firmware compiled with the SDK15.3 it's working.

As I have stated here, the flash_placement have changed between the two version, so which one should I use ?

Thanks for your advice

[StephaneJ]

I have copy/paste my working version of the examples/dfu folder from SDK15.0 and tried to build it on the SDK15.3

I have modified all the changes required in order to build it (some path that have been changed, removed/added some define in sdk config, etc.) and now it looks like it's working so far...