Hi PeterThe issue was with the wiring.! Target Vcc (Pin no 1) was not connected to 3.3V.I connected to 3.3v and now it works fine.Thank you.BR Goutham

Hi PeterI am facing same issue on 2 ST-Link I bought from Digikey. I can see the serial number on both.Cube programmer ver: v2.15.0FW ver: V2J43S7Below is the image of ST Link.Please help!RegardsGoutham