You will need Mi Phone tool to be able to connect your Redmi 1S to PC. Download the tool from the link - http://enbigota.d.miui.com/tools/MiPhone20140509.exe Make sure your device drivers are properly installed. You can check the drivers from this link - http://en.miui.com/forum.php?mod=viewthread&tid=26278&page=1#pid505593 If it still does not connect, you may need to update your phone to the latest firmware. Also make sure you have enabled USB Debugging. You can do it from Developer options in the settings menu.