Recovery mode : You would like enter a recovery mode if your current iphone firmware is corrupted or not running properly and you would like to restore it to the original iphone firmware or firmware greater than the current one.
( This is useful if your on AT&T and have an activated SIM . If your on jailbroken or unlocked phone, DO NOT go for this as it would wipe off your jailbroken or unlocked privileges )
DFU mode : Very similar to recovery mode but is meant for downgrading your current firmware or to install a custom firmware.
To enter a recovery mode , there are several timing techniques . The most common one is to press both Power Button + Home Button together for about 10 seconds then release the power button and keep pressing the Home Button for another 6-8 seconds. This is very easy.
( Your screen would go blank once you enter Recovery Mode )
The biggest hassle is to enter into DFU mode. You would probably end up getting in restore mode almost everytime. There are again a lot of time techniques related to it but i personally couldnt successfully test any of them frequently. Recently i came up with a solution where you dont have to keep an eye on the clock.
To enter DFU mode , all you have to do is to just keep pressing both Power Button + Home Button together. After about 15 seconds , you would see the apple logo on the screen ( do nothing but just to keep holding the 2 buttons ).After another 20 seconds , you would see the itunes logo with the USB cable on the iphone screen, release both the buttons now. Your now in DFU mode :)
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