How can you unlock an ipod nano

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/

How to 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.
Things You'll Need:
iPod Nano Mac or PC computer iPod USB cable
1 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.
2 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.
3 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.
4 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.

Thank you for contacting Fixya Support, glad to assist.

I have a great article which will provide you simple but detailed step by step procedures on how to unlock your iPod Nano.

How to Unlock a Locked iPod Nano

This are proven steps, but if you have any issues, please reply back to this post.

Regards,

-Mactechtrainer

Reconnect your iPod to the Primary Computer where you set up the iPod originally. This will unlock the iPod and allow you to change the lock code.
Peter

When you lock an iPod nano that is not connected to a computer, you must enter a combination to unlock and use it. ... . You can unlock your iPod nano in two ways ... Connect iPod nano to the primary computer you use it with, and iPod nano automatically unlocks . Note: If you try these solutions and you still can’t unlock iPod nano , you can restore iPod nano.

Hi

To unlock your ipod you'll need to connect it with the pc it is last synced to. After connecting it open itunes and from the main screen click on restore, it will unlock your ipod.

Remember after restoring you'll lose the menu settings and other settings saved on your ipod however no data will be deleted from the ipod.

Please accept the solution and revert for further assistance.

Thanks
Rylee

put your ipod on iTunes and restore it to factory settings.
That will remove the lock

Apple iPod is Locked

There is only one way - and it will erase all your songs (applies to most models, not just Nano):

If you lock your iPod nano screen and can’t unlock it
Normally, if you can connect your iPod nano to the computer it is authorized to work with, your iPod nano automatically unlocks. If the computer authorized to work with your iPod nano is unavailable, you can connect iPod nano to another computer and use iPod Updater to restore your iPod software. See the next section for more information.
If you want to change the screen lock combination and you can’t remember the current combination, you must restore the iPod software, and then set a new combination.
Updating and Restoring iPod Software
You can use iPod Updater to update or restore your iPod software. Apple periodically
updates iPod software to improve performance or add features. It is recommended that
you update your iPod nano to use the latest software. You can also restore the software,
which puts iPod nano back in its original state.
- If you choose to update, the software is updated, but your settings and songs are not
affected.
- If you choose to restore, all data is erased from your iPod nano, including songs, files,
contacts, photos, calendar information, and any other data. All iPod nano settings are
restored to their original state.
To update or restore iPod nano with the latest software:
1 Go to www.apple.com/support/ipod and download the latest iPod Update. The update
has the latest software for all models of iPod.
2 Double-click the software installation file and follow the onscreen instructions to install
the iPod update.
3 Connect iPod nano to your computer and open iTunes. The iPod Updater application
opens.
If you’re using a Windows PC and the iPod Updater application doesn’t open
automatically, you can find the updater by choosing Start > All Programs > iPod.
4 Follow the onscreen instructions to update or restore iPod software.
If you use the iPod Updater application and it doesn’t recognize that iPod nano is
connected to your computer, reset iPod nano (see page 45).
If you want to restore iPod software and you don’t have an Internet connection, you
can use the iPod Updater application that was installed on your computer when you
installed the software from the iPod CD.

-Tha Mp3 Doctor

There is only one way - and it will erase all your songs:

If you lock your iPod nano screen and can’t unlock it
Normally, if you can connect your iPod nano to the computer it is authorized to work
with, your iPod nano automatically unlocks. If the computer authorized to work with
your iPod nano is unavailable, you can connect iPod nano to another computer and
use iPod Updater to restore your iPod software. See the next section for more
information.
If you want to change the screen lock combination and you can’t remember the
current combination, you must restore the iPod software, and then set a new
combination.
Updating and Restoring iPod Software
You can use iPod Updater to update or restore your iPod software. Apple periodically
updates iPod software to improve performance or add features. It is recommended that
you update your iPod nano to use the latest software. You can also restore the software,
which puts iPod nano back in its original state.
â If you choose to update, the software is updated, but your settings and songs are not
affected.
â If you choose to restore, all data is erased from your iPod nano, including songs, files,
contacts, photos, calendar information, and any other data. All iPod nano settings are
restored to their original state.
To update or restore iPod nano with the latest software:
1 Go to www.apple.com/support/ipod and download the latest iPod Update. The update
has the latest software for all models of iPod.
2 Double-click the software installation file and follow the onscreen instructions to install
the iPod update.
3 Connect iPod nano to your computer and open iTunes. The iPod Updater application
opens.
If you’re using a Windows PC and the iPod Updater application doesn’t open
automatically, you can find the updater by choosing Start > All Programs > iPod.
4 Follow the onscreen instructions to update or restore iPod software.
If you use the iPod Updater application and it doesn’t recognize that iPod nano is
connected to your computer, reset iPod nano (see page 45).
If you want to restore iPod software and you don’t have an Internet connection, you
can use the iPod Updater application that was installed on your computer when you
installed the software from the iPod CD.

-Tha Mp3 Doctor

you first have to find out if it's a screen lock (you can succesfully connect it to your computer) or a "manage lock" (connecting doesn't work too)

if it's a screen lock, connect the ipod the the computer you first used it with (the one you used to install the ipod), open itunes and then disconnect again, it should be unlocked

if it's a manage lock, connect the ipod to the computer and restore the factory settings, warning, this will erase ALL data.
then reconnect it and synchronise