Unlock an iPod Model A1199
Although the second generation iPod Nano (also known as 2G)
uses a four-digit pass code that prevents unauthorized access to your iPod by
locking the screen, you can also unlock the device by plugging it into your
computer's USB 2.0 port.
When the 2G iPod Nano is connected to the computer it is
synchronized, and automatically unlocks the screen according to the official
Apple site.
In order to successfully unlock the Nano it must be plugged
into the primary computer used for synchronizing content.
Click "Start," "All Programs" and "iTunes" on
your PC's desktop, or click "iTunes" on the Macintosh's desktop dock.
Plug the iPod Nano's cable into the docking port on the iPod
Nano.
Plug the other end into the USB port on the computer to open
iTunes.
Click "Controls" at the top of the iTunes' menu,
and select "Eject iPod."
The iPod Nano's screen will be unlocked once it is ejected
from your computer.
Manual Guide download
http://manuals.info.apple.com/en_US/iPod_nano_2nd_Gen_Features_Guide.pdf
Unlock an iPod Nano Code
With the latest iPod Nano model, you can set a four-digit
code and lock all intruders from accessing your iPod.
In order to use the device's functions again, you need to
enter the correct code.
However, if you happen to lose or forget the code, you will
need to find another way to unlock your iPod Nano.
Plug the iPod USB cable into the bottom of your iPod Nano.
Plug the other end of the USB cable into a free USB port on
your Mac or PC computer.
Open the iTunes program by using the Dock on a Mac or the
Start menu on a PC.
Select your iPod Nano from the "Devices" list in the main iTunes
window.
Click on the "Sync" button to make a connection
between your computer and your iPod Nano.
Click on the "Eject" symbol
once the syncing process is complete.
Remove your iPod Nano from the USB cable.
The iPod's lock code will now be reset and you will be able
to access all features again.
Navigate to the "Screen Lock" option in the iPod
menu to lock your iPod's screen again.
Since your iPod's lock code was just reset, you will be
prompted to select a new four-digit code.
iPod Support
http://www.apple.com/support/ipod/
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