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?

[liujirong888]

Would you also teach me that how to use nrfgo studio to readback softdevice?

I found that the nrfgo studio readback softdevice is different from the original softdevice.