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Nanos have special modes that they can boot into called disk mode, DFU mode, and debug mode.

Disk mode

Disk mode has existed ever since the iPod has existed. Disk mode is stored in the 1MB NOR auxillary flash (along with the bootloader), so this is pretty much always there, no matter what sort of tampering you have done. Disk mode basically makes the iPod behave as a massive storage device, allowing the computer to directly read and write the data flash chip. For more information on how to enter Disk mode (or Reboot), refer to the Key Combination page from iPodLinux Wiki.


(iPodLinux project)

DFU mode

DFU (Device Firmware Upgrade) mode is a relatively new standard for upgrading firmware that is used in many devices like the OpenMoko and the newer iPods. DFU mode (since nano 2G) is contained in the on-processor bootrom. Newer iPods have both DFU mode and disk mode, while iPod Touch and iPhones have exclusively DFU mode. It is worth noting that DFU mode was implemented at the exact time that Apple switched from PortalPlayer to Samsung processors.

The Nano 2G also has a DFU mode, but this mode can only be entered by shorting testpoints on the circuit board or flashing the NOR with an image with a wrong signature/hash.

Getting DFU mode on iPod Classic, Nano 3G and newer

  1. Make sure your iPod is turned on and connected to your computer.
  2. Press the menu button and select (central) button simultaneously.
  3. The iPod's screen will go black, and the Apple logo will shortly appear.
  4. Keep on pressing till the Apple logo turns into a black screen. This is about 10 seconds.
  5. Release the menu and select buttons.

You can use lsusb to determine if your iPod is in DFU mode. 05ac is the vendor ID (apple), and the number after the colon is the Product ID. The product ID depends on whether the iPod is in DFU mode or not. Here is a table of product IDs:

Device Normal DFU
Nano 2G 1260 1220
Nano 3G 1262 1223/1224
Nano 4G 1263 1225
Nano 5G 1265 1231
Nano 6G 1266 ????
Classic 1G 1261 1223
Classic 2G 1261 1223
Classic 3G 1261 1223

DFU utility

TheSeven has written for communicating with the iPod's DFU interface. It also has a utility called for uploading files in DFU mode. These utilities can be found in the SVN repository.

Debug (diagnostics) mode

This mode will give quite a lot of info about your iPod. Except for the very first iPods, it can be accessed by holding center and rewind when the apple logo appears during reboot.

Helpful pages