Solution: Windows PC not reading Xiaomi Phone via USB cable

1. The first step is to enable developer option in the phone.
   Go to Settings -> About Phone and tap MIUI version 6 times. You will see a pop up notification confirming that the developer option is enabled.
2. Now enable USB debugging in the phone
   Go to settings -> Additional Settings -> Developer options then enable USB debugging.
3. Now connect your Xiaomi phone to your Windows PC via USB cable. When you connect phone to the PC, it might ask to select an option to connect for charging only or files transfer. Make sure to select files transfer option.
4. On your computer go to PC -> C drive (or whatever is the installation drive of your Windows) -> Windows -> INF -> Look for wpdmtp.inf. Right click on wpdmtp.inf and click install with your phone plugged in.

Now you should see the phone showing up under PC.