I don't know how to unlock my ipod

I think the only way is to restore your iPod from the backup. Leawo iOS Data Recovery will help you know how to restore iPod touch without iTunes. This software is used for recovering deleted files from iOS devices, extracting data from iTunes and iCloud backups, so it is useful for recovering deleted files from iPod touch. The following guidance will show you how to restore iPod touch without iTunes, and you can free download Leawo iOS Data Recovery and have a try. Download Leawo iOS Data Recovery ' Leawo iOS Data Recovery for Mac and install it.
Step 1. Run Leawo iOS Data Recovery and choose Recover from iOS Device.

Step 2. Connect iPod touch to computer with USB and click the Start button.

Step 3. The program will scan your iPod touch. After the scan, check the files you need and click Recover.

Step 4. Click Open in the pop-up dialog to choose a target folder on your computer to save the files. Then click Go to start restoring iPod touch without iTunes. For more detail, check: For more detail, check: How to Restore iPod touch without iTunes

Restore the iPod can solve your problem, follow this guide to restore iPod to factory settings.

How to restore iPod (ARTICLE NUMBER HT1339)
Open iTunes, and then connect your iPod to your computer using the USB or FireWire cable that came with your iPod.

After a few moments, your iPod will appear in the Source panel in iTunes.
Select your iPod in the Source panel and you will see information about your iPod appear in the Summary tab of the main iTunes windows.

Click the Restore button. You will be prompted with one or more restore options that may prompt iTunes to automatically download the latest iPod Software.

The 4 possible restore options are: Restore Option

1: Restore - Restores with same iPod Software version already on iPod. Restore Option

2: Use Same Version - Restores with same iPod Software version already on iPod even though a newer version is available. Restore Option

3: Use Newest Version - Restores with the latest iPod Software available. Restore Option

4: Restore and Update - Restores with the latest iPod Software available.

If you are using a Mac, a message will appear prompting you to enter an administrator’s name and password.

A progress bar will appear on the computer screen indicating that the first stage of the restore process has started.

When this stage is completed, iTunes will present one of two messages on screen with instructions specific to the iPod model you are restoring.
Restore Instruction 1: Disconnect iPod and connect it to iPod Power Adapter (typically applies to older iPod models).


Restore Instruction 2: Leave iPod connected to computer to complete restore (typically applies newer iPod models).

During the stage 2 of the restore process, the iPod will show an Apple logo as well as a progress bar at the bottom of the display. It is critical that the iPod remains connected to the computer or iPod Power adapter during this stage.

Note: The progress bar may be difficult to see since the backlight on the iPod display may be off.

After stage 2 of the restore process is complete and the iPod is connected to the computer, the iTunes Setup Assistant window will appear asking you to name your iPod and choose your syncing preferences similar to when you connected your iPod for the first time.