Could not fetch memory size of target devkit: Error: Error occured when get library info. Errorcode: CouldNotOpenDevice (0x4) Lowlevel error: Unknown value (ffffff5e)

[christian11]

I have seen this question asked a few times--but every thread seems to have no concrete answer.

I have uninstalled and reinstalled all JLINK drivers.

But still get the errors.

I have nrf52840 dk and am using windows 10

[Albrecht Markus Schellenberger]

Thanks for the feedback, Christian!

The root cause here could be a lot of different things, so we just have to go through it step by step.

What is the installation path of the nRF Command Line Tools and the nRF Connect?

Regards,

Markus

[christian11]

 nRF Command Line Tools is installed on the C: drive, in the same location as the J-Link.

nRF connect is installed in the C: drive in a different location.