Firmware

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This article is about the different parts of the iPod's firmware. There is also a very basic analysis of the firmware headers. If you are trying to get a copy of the firmware files, please see Dumping firmware and Extracting firmware. NOTE: Please excuse the chaotic layout of this article. It is not very comprehensive, but it's still useful.

Contents

Nano 2G

osos

This is the main firmware image of the iPod. This part has been encrypted ever since the iPod Nano 2G.

caption

Firmware layout.png

aupd

Here is a comparison between the different aupd partitions of firmware version in the iPod Nano 2G:

caption

IN2G cipher aupd diffs.png

rsrc

This is the resource filesystem of the iPod firmware. It is unencrypted and of not much use to this project.

Nano 3G

The Nano 3G has the same osos, aupd, and rsrc sections as the Nano 2G, but it also has an added hash section. The hash section is populated with 0x1800 bytes of 0xFF.

Classic 1G (6G)

The Classic 1G has the same firmware structure as the Nano 3G. This makes sense because they were released at the same time.

Nano 4G

The Nano 4G kept the osos but all the old sections were removed. Instead, seven new sections were added:

Helpful pages

http://home.gna.org/linux4nano/download/crypto_synth-1.0.pdf

http://www.ipodlinux.org/wiki/Firmware

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