Both recovery and DFU modes are often confusing which just adds to the frustration when accidentally put into either of these modes. You don’t have to restore completely in iTunes. That takes up a lot of time (around 20 minutes and if you have data, it may be longer to get it all back up and running). You can give the following combinations a shot and I have tested them both on iPhone 3.0.
DFU Mode :

Steps to recover from DFU mode :

Connect your iPhone to your computer.
Hold down the …