My iPhone 6 can not connect wifi. The wifi on/off button is always in grey. And the phone didn't react when someone...

my friend's iPhone 4 screen is broken. the half screen can not repond to touch. is that work if i just replace the screen?

is your iPhone can work well before you update?

take down the screen to see whethere the cable is broken or get loose. if not . maybe the screen is broken.

replace the lcd screen maybe is a good idea .

http://www.aliexpress.com/store/product/...-PCS-for-iPhone-5S-4-inch-IPS-OEM-LCD-Display-Digitizer-Touch-Screen-Frame-with/1294129_32222622185.html

connect the Phone with computer. press and homebutton and power key. when Apple LOGO show up, immediately release the power button and continue holding the HOME button until the phone shows a data cable link iTunes icon. then open iTunes icon on your computer, it will show links to be restored on an iPhone, click recovery point or restore the system you want to update. http://www.aliexpress.com/store/product/...-PCS-Black-White-100-Tested-High-Quality-LCD-Display-Digitizer-Touch-Screen-with-Tools-LCD/1294129_32219396130.html