Apple iphone5s the bottom of the screen has been flashing solution

Problem status

The phone was hot, so it restarted.
After reboot, the screen has been flashing at the bottom.
The blink rate is too fast to record.
Black and White will not flash.
The most serious flash in gray.

Solutions

First, download the most recently installed software programs, can not be resolved to try to restore the device! Use itunes to completely restore the phone to the factory state. First you have to search the Internet to restore the iOS firmware version number, download to the computer. Then connect the phone to the computer and open the itunes software. Select the mobile device, press and hold the "shift" on the keyboard, then click on the itunes Software recovery button with your mouse, and select the firmware that you downloaded before you recover. If you have a backup you do not need to download the firmware, but also restore before the backup, restore the factory settings will erase all content and data.

Second, if none of the above methods can solve your problem, you'd better make an appointment to authorize a maintenance provider or Apple Store for testing.