You mean DFU mode? It is a feature that can fix iDevice bugs or glitches when you face issues. But sometimes, if you face the iDevice stuck in DFU mode, you can use iTunes to fix the stuck issue or use an iOS repair tool like UltFix, TunesKit, Tenoshare....
It is an Iphone status.
Angad Clayton and Kevin
Dfu mode is usually used to jailbreak your iPod touch
they dont
Hi To put your device in DFU mode Hold the sleep/wake button and the home button for 10-20 secs. Easy.
Try disabling antivirus and farewell, than try to go to dfu mode by yourself until you see apple logo, and if it doesn't work try reinstalling redsnow
Connect it to your computer and open iTunes. Restore it.
Put it in DFU mode
You have to find the Recovery and DFU USB codes and implement them into libirecovery.
To much volume based on DFU's
Well, if you tried holding the home screen button for 10 seconds and the DFU mode did not come up then, you can see if it lets you restore it on iTunes.
I assume you don't mean a cellular unlock, but rather unlocking to the home screen on the phone itself. To bypass this, you must restore the iPhone in iTunes, using DFU mode. Google, "enter DFU mode" and you'll find it.
You can put the iPhone into DFU mode and do a full restore via iTunes, this is similar to "flashing".