I am programming with SDK15.0. Then I use nRFgo studio to download the merged program to the DK board. But it reported a validation failure. So I tried to download softdevice and bootloader separately to find out the problem. It still reporting an error. But Everything works fine when I use Keil download. Could you tell me where the problem is?
I am not sure if nRFgo Studio fully supports programming the nRF52840, as the nRF52840 is a relatively new SoC. Can you use either nrfjprog (part of nRF Command Line Tools) or the nRF Connect Programmer application instead? nRFgo Studio has not been actively developed lately, and we recommend the tools that I just mentioned for new development.
Regarding the validation failure, when exactly does it happen, and what exactly does the error look like?
When I try to download softdevice and bootloader (nRF5_SDK_15.0.0_a53641a\examples\dfu\secure_bootloader\pca10056_ble) to 52840 (PCA10056) DK board with nRFgo studio, verification failure will occur.
Can you write the full exact error message here, or provide a screenshot of the error message?