Q: iPhone 6 can't connect to iTunes after iOs 9.3.2 upgrade

Are you using the most current version of iTunes (12.4)?

Doing so requires at least OS X 10.8.5 or Windows 7.

Be sure your iTunes is current.

http://www.apple.com/itunes/download

If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support

Remove and reinstall iTunes and related software components for Windows 7 and later - Apple Support

Hi Buddy,

If you already installed the latest stable version of iTUNES on your computer (Windows 7 ) only-

Please disconnect the Device from Lightning cable

check the Drivers installed>>Click start>run>"Devmgmt.msc"

Check the Universal serial BUS Controllers > If the New drivers regards to apple iphone is listed

click on SCAN FOR CHANGES- Repair If needed >Restart the Asset as well the Phone

Now connect the Device and wait until it gets detected automatically

right Click and check the the settings>> Manage Device Manually

Good luck!!