Can i change the antenna power with software?
I just openned the file in sdk.
Do you have a licence for Keil u5? Have you installed the latest J-Link drivers?
No - look again at the message: it tells you specifically which file it failed to open.
It's the .axf file - which is the result of a successful build.
Therefore, if the build failed, or you have not done a build at all - you are going to get that message!
The download will fail if there is nothing to download!
AndreasF said:Do you have a licence for Keil u5? Have you installed the latest J-Link drivers?
Those things would give different errors - It's complaining that it can't find the .axf file.
(although lack of a licence could be a reason for the build to fail and, therefore, not generate the .axf)
Yes, I think it is complaining about not finding the .axf file because it cannot build the project without a licence, because the project is to big.
Here, I've recreated the error by trying to build the project in Keil 5 without a licence:
First error: Cannot build because the project is to big
Second error: Cannot flash, because the .xaf file does not exist:
You can use Segger Embedded Studio for free with Nordic Products, It has not this limitation, and I suggest you use that if you do not wish to pay for a license.