Hey Cory,

I'm not sure, but I believe we had already figured out that the 4G  
used the same processor. Thanks for the tip, though. Now, the thing is  
this probably won't help us, because the 4G nano probably uses IMG3  
based encryption, which means that if we want to decrypt it, we have  
to run unsigned code on the hardware to use the aes engine and the gid  
key, which we can't do yet. I guess there's a teensy chance that the  
nano 4G uses the same gid key as the touch 2G, in which case we could  
decrypt the nano 4G firmware files with the 2G, but this is unlikely,  
and would be very stupid of Apple.

Ari

On Feb 26, 2009, at 7:24 PM, Cory Walker wrote:

> I was doing some research for a wiki page, and I was checking out  
> the 4G
> Nano's .ipsw file. There was a file in there called
> N58s.bootloader.release.rb3, and I opened it. It turned out to be
> machine code up until the end where clusters of strings were listed  
> that
> mentioned things like "Apple iPod Certification Authority", "S5L8720",
> and "Secure Boot". If the 4G Nano uses these things, It would be  
> almost
> exactly similar to the iPhone 2G. If the 4G uses the S5L8720  
> processor,
> it would be the exact same as the iPod Touch 2G. It is also likely  
> that
> the 4G Nano uses the same Secure Boot technology as iPhones and iPod
> Touch's. A key could also be hidden in here. Didn't someone say that
> they had helped jailbreak the iPod Touch 2G? The 4G could be extremely
> similar.
>
> -Cory Walker
>
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