[Solved] Using PuTTY as a serial connection

Hi,
I’m attempting to use putty to get a serial window working. I’ve followed the tutorial in Docs and downloaded the patch etc. When the core is in listening mode (Flashing blue) the core appears in device manager and using the terminal I can get the device ID. When I reset the core and try and access it using the same details, it doesn’t work. the error I get is: “Unable to open connection to COM3 Unable to open serial port”. Would be much appreciated if someone could help me out, thank you.