Adb not showing any device due to localhost doesn't point to 127.0.0.1

1- Do the following:
Go to ->windows->system32->drivers>etc->host 
remove-> ::1 localhost set-> 127.0.0.1 localhost 

2- Do the following:
Replace your platform-tools with this one and delete the other one. https://dl.google.com/android/repository/platform-tools_r26.0.0-windows.zip