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Jlink cannot connect anymore

Hello, My rigado BMD 200 board suddenly stopped responding. the Jlink interface cannot connect I tried nrfjprog --recover with no success.(says cannot connect) in segger embedded studio, when I connect to target, dialog says no idcode detected.

The interface is seen correctly but the target would not connect.

This occurred after I had a connection conflict with nrfgostudio (I had a connection running with RTT viewer) then I had a interface change request dialog. Then I don't know whether I clicked yes or no but I cannot connect anymore.

I used Jlinkconfig to replace the firmware and reset config but this still does not work

I have had several conflicts like that that I solved by reinstalling tools or don't know how but this time this is breaking my nerves. thanks for your help

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