Hi Phill,

DFU mode stands for device firmware update. It is used if you wish to downgrade 
your iOS or jailbreak the phone. YOu can interface with it via iTunes, but it's 
a mode that occurs before the operating system can load.
Source:
http://osxdaily.com/2010/06/24/iphone-dfu-mode-explained-and-how-to-enter-dfu-mode-on-your-iphone/
Hope that helps,
Rachel 
On Jan 29, 2013, at 2:41 PM, "Phil Halton" <[email protected]> wrote:

> care to be a little more specific? I've never heard of DFU mode.
>  
> ----- Original Message -----
> From: Scott Berry
> To: [email protected]
> Sent: Tuesday, January 29, 2013 12:39 PM
> Subject: a question about DFU mode
> 
> How does one tell when your in DFU mode?
> 
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