CAUTION: Tool is not updated. Connect PC to the Internet and run software again)
Change another laptop / use another USB cable for reflash by J-Link, disconnect internet connection, re-install ksuite software and driver. Run again the Ksuite software.
If ksuite v1.8x doesn’t work, try ksuite v1.93. Most people managed to solve this issues with the help of ktag ksuite 1.93.