how to use nrfjprog to readcode?I have an error as pic below

[liujirong888]

Hi expert,

       how to use nrfjprog to readcode?I  have an error as pic below:

and how to seperate readback application and softdevice?

[Jørgen Holmefjord]

Which device are you trying to read? I'm not getting any error using the first command on my PCA10040 board (nRF52-DK).. The second command is missing file parameter where you want to store the read code. 

[Jørgen Holmefjord]

You need to provide a file path to the --readcode command as well: 'nrfjprog --readcode code.hex'.

I'm not sure what the error/warning means. It looks like the operation continues and completes as expected. Could you try with the --log argument, and post the result found in log.log file? 'nrfjprog --log --readuicr soft.uicr'