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....
Angad Clayton and Kevin
Dfu mode is usually used to jailbreak your iPod touch
To convert discharge measurements from dekaliters per minute (dfu) to gallons per minute (gpm), you can use the conversion factor where 1 dekaliter equals approximately 2.64172 gallons. Therefore, to convert dfu to gpm, multiply the value in dfu by 2.64172. For example, if you have 10 dfu, the conversion to gpm would be 10 dfu × 2.64172 = 26.4172 gpm.
they dont
Hi To put your device in DFU mode Hold the sleep/wake button and the home button for 10-20 secs. Easy.
DFU (Device Firmware Update) mode itself does not automatically wipe your device's memory; it allows you to install firmware or restore your device without loading the operating system. However, if you proceed with a restore or update in DFU mode, it will erase all data on the device. Performing DFU mode incorrectly, such as disconnecting the device during the process, may lead to issues, but it typically won't erase your memory unless you initiate a restore.
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
To much volume based on DFU's
You have to find the Recovery and DFU USB codes and implement them into libirecovery.
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.