My iPhone 5s has sudden turn off, then i restart it. It turns out its has been into an ultimate loop of blue screen and restarting. Then i tried to force turn on by pressing both power and home button. It turns on with a red screen, after that strange pattern appear on the phone screen
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Entering DFU Mode
1. Plug your device into your computer.
2. Turn off the device.
3. Hold the Power button for 3 seconds.
4. Hold the Home button without releasing the Power button for 10 seconds.
5. Release the Power Button but keep holding the Home button.
6. Keep holding the Home button until you are alerted by iTunes saying that it has detected a device in Recovery Mode
Make sure the device screen is blank and no logos are present.
Restore the phone
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What if you don’t have a computer??
Without a Pc you can't really do much, for a factory restore it is necessary. However a reboot pattern with blue/red screen often points to a hardware damage involving the nand memory that can't be solved by a restore.
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