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Topic: iPod Nano 7th Generation Possible Hacks

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Old 03-01-2017, 07:58 PM
#136
 
Freshman Lounger
 
Join Date: Mar 2017
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1.0.3 rsrc image extraction

Hi there,

I discovered recently I had a Nano 7, and was wondering what I could do with it. I discovered this thread, and began playing with it. I think that I might have been able to create a tool to compress the fw's back into the Firmware.MSE (I've managed to compress regular fw's, but not modified versions since I don't know how do modify them reliably). Availble on GitHub under ninjaprawn/compress7g

I was wondering if anyone has managed to extract an rsrc image from the file for 1.0.3, and managed to mount it on Mac (Sierra)?
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Old 03-03-2017, 04:29 PM
#137
 
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Nevermind. For those interested, the disk image is formatted with a MBR, and Sierra doesn't seem to like it, so I booted into Windows to view and modify it.

It seems that modifying it wasn't as easy as I thought. I tried sending through my modified rsrc file, but the iPod went into "Bad Software" mode after booting for a little. I examined the rsrc file header, and I believe there may be a hash, possibly SHA1, that is used to check the file. The problem is that I'm not sure which region of the overall file is being hashed. I've got some brute-forcing going, but I'm not sure if I will get far. (potential hash is at offset 4160)
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Old 03-04-2017, 09:45 PM
#138
 
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Never mind the theory on the hash. I removed some content from the header of the rsrc file, and it somehow worked! I only did a minor change of changing the long title of the "Basic" workout from "Basic Workout" to "The Basic".

I'll see what I can do in terms of theming. Luckily there are a ton of posts about the structure of the SilverDB file. I'll first write a viewer for the image files, since they aren't the normal png/jpg formats. Once I do that, I'll have a better understanding of the image structure, and see what I can do to modify the images.
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Old Today, 12:58 AM
#139
 
Junior Lounger
 
Join Date: Jul 2013
Posts: 30

Quote:
Originally Posted by ninjaprawn View Post
Never mind the theory on the hash. I removed some content from the header of the rsrc file, and it somehow worked! I only did a minor change of changing the long title of the "Basic" workout from "Basic Workout" to "The Basic".

I'll see what I can do in terms of theming. Luckily there are a ton of posts about the structure of the SilverDB file. I'll first write a viewer for the image files, since they aren't the normal png/jpg formats. Once I do that, I'll have a better understanding of the image structure, and see what I can do to modify the images.
Nice! Have you tried replacing any of the music/sounds? And can I have a link to the tool you are using to send over modified rsrc files?
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Old Today, 01:50 AM
#140
 
Junior Lounger
 
Join Date: Jul 2013
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I had a look into SilverImagesDB.LE.bin, and found an interesting unused icon:
Click the image to open in full size.
Any ideas as to what it is for?
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