Short for Device Firmware Update mode, the DFU mode can help you perform many specific tasks on your iPod touch models, such as gaining access to root, troubleshooting problems with the OS, updating or downgrading your firmware, jailbreaking, etc. However, when you try to enter iPod touch into DFU mode (including iPod touch 5th generation, 4th generation, 3rd generation, 2nd generation, and 1st generation), you may suffer some problems, like "iPod touch DFU mode not working", "iPod touch DFU mode USB device not recognized", etc. For your information, here is the iPod touch DFU mode tutorial to help you successfully put your iPod touch into DFU mode.
How to Put iPod Touch in DFU Mode on Mac or Windows?
iPod touch DFU mode makes the display on your iPod touch black and it is indistinguishable from the device being turned off. After entering the DFU mode to gain root access, troubleshoot problems, jailbreak, update or downgrade, you may get stuck and suffer data loss, so it is extremely significant for you to backup your data before you put iPod touch in DFU mode
1. Backup iPod touch
You can backup your iPod touch 5/4/3/2/1 in 3 methods.
iTunes backup: Sync with iTunes or right-click (control-click) your iPod touch in the Devices section and select "Back Up".
iCloud backup: Go to Settings on your iPod touch, select "iCloud" and "Storage and Backup".