iPhone Won’t Turn On after iOS Upgrade, How to Fix It?
“My iPhone 6 won't turn on after I installed the iOS 9. After 2h in use on iOS9, it begins to restart for itself, than it stopped and won't turn on anymore. It’s dead, not responding at all, black screen, no logo or nothing, I already tried hard resetting the iPhone, connected or disconnected, plugged to my pc, and nothing, what else can I do?”
- Apple Community
Though most people run the latest iOS 9 smoothly, there are still some people encounter kinds of problems unfortunately. iPhone won’t turn on after iOS 9 update is one of the most asked question. If you are one of the unlucky guys, firstly try to recharge your iPhone, hard reset by pressing home and power button, restore with iTunes. If none of them helped, you need an advanced systemcare for iOS tool for help.
Tenorshare iPhone Care Pro is recommended iOS system care software trusted by thousands of users. It can easily fix all iOS stuck issues by entering and exiting Recovery Mode, or fundamentally solve all iOS issues by repairing operating system.
Firstly free download and install iPhone Care Pro. Plug your iPhone to computer with an USB cable.
Method 1: Fix iPhone Won’t Turn On after iOS Update with Recovery Mode
Run iPhone Care Pro and select Fix iOS Stuck in the main interface.
Step 1: Click the button under "Enter Recovery Mode" and you will see your device display the classic USB to iTunes logo (Recovery Mode).
Step 2: Click the button under "Exit Recovery Mode" and the device will boot up. After the rebooting process, your iPhone will be back to normal state.

Method 2: Fix iPhone Won’t Turn On after iOS Update by Repairing Operating System
Run iPhone Care Pro and select Repair Operating System in the main interface.
Step1: Download Firmware Package. Then the software will offer an official URL to you. Just copy the URL and paste it in any browser to download. After this, click Next.
Step 2: In the next window, click "Browser" to select and import the firmware into this iPhone Care Pro and then click on "Next" to proceed.
Step 3: In the next window, click "Browser" to select and import the firmware into this iPhone Care Pro and then click on "Next" to proceed. After the operating system repair process, your iPhone will restart to normal state.

Done! iPhone Care Pro will offer overall care for your iOS device. Seeing is believing, come and give the fantastic software a shot! Read more: http://www.tenorshare.com/.