But don't worry! I have encountered a similar problems and my phone was completely out of the question. The things happened as follows. That day, after I jailbreak my iPhone 7, it could not turn on. This has brought me a great trouble, because I had an important meeting tomorrow and I must go. So I didn't have enough time to take my iPhone to the maintenance point. Fortunately, my friend recommend a software to me that is Dr.Fone for iOS. At last, I repaired my iPhone 7 that won't turn on in time.
Steps to Repair iPhone 5/5S/6/6S/7 that Won't Turn On
Step 1. Launch Dr.Fone for iOS
First of all, launch Dr.Fone for iOS. Then choose "More Tools" in the left side of the window and select "iOS System Recovery". Don't forget to connect your iPhone to computer, then click "Start".
Step 2. Select and Download the firmware
It is the firmware that able be used to fix the iOS system. You need to download it for your crash device. Dr.Fone for iOS will recognize your device and offer the latest iOS version for you. So you can download it directly or select the other version by yourself. Then click "Download" and wait it.
Step 3. Fix your device to normal
The download process will last for a little while and once it completed, the program will begin to repair your device automatically. The whole process also need a few moments, you just need to keep your device is connected. And then you can use your iOS device as normal.
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