Can not sync device to restore full functionality

If you've synced your device with iTunes, you can restore your device.

1. Connect the device to the computer you normally sync with.
2. Open iTunes. If iTunes asks you to enter your passcode or asks you to allow access, try another computer that you've synced with. Or use recovery mode. (Click the link to be taken to the steps.)
3. iTunes will automatically sync your device and create a backup. If it doesn't, sync the device with iTunes.
4. After the sync is complete, restore your device.
5. When iOS Setup Assistant asks to set up your device, choose "Restore from iTunes backup."
6. Select your device in iTunes and choose the most recent backup.

If you have synced your device with iTunes, you can restore your device.

1. Connect the device to the computer you normally sync with.
2. Open iTunes. If iTunes asks you to enter the passcode, try another computer that you've synced with.
3. iTunes will automatically sync your device and create a backup. If it doesn't,sync the device with iTunes.
4. After the sync is complete, restore your device

• DANGER THE FOLLOWING WILL ERASE EVERYTHING

You'll need to put your device in recovery mode, which will erase the device and its passcode. Then you'll restore your device as new or from a backup.

1. Disconnect all cables from your device.
2. Turn off your device.
3. Press and hold the Home button. While holding the Home button, connect your device to iTunes. If your device doesn't turn on automatically, turn it on.
4. Continue holding the Home button until you see the Connect to iTunes screen.
5. iTunes will alert you that it has detected a device in recovery mode.
6. Click OK, then restore the device

If you have previously synced your device with iTunes, you may be able to reset the passcode by restoring the device:

1. Connect the device to the computer with which you normally sync and open iTunes.
   Note: If iTunes asks you to enter the passcode, try another computer that you have synced with. Otherwise, go to "If you have never synced your device with iTunes, or you do not have access to a computer" section below.
2. If the device is still disabled, or if iTunes does not automatically sync your device, sync the device with iTunes.
3. When the backup and sync is complete, restore your device.
4. When iOS Setup Assistant asks to set up your device, choose "Restore from iTunes backup".
5. Select your device in iTunes and choose the most recent backup of your device.

If you have previously synced your device with iTunes, you may be able to reset the passcode by restoring the device: Connect the device to the computer with which you normally sync and open iTunes. If iTunes asks you to enter the passcode, try another computer that you have synced with. Otherwise, go to "If you have never synced your device with iTunes, or you do not have access to a computer" section below. If the device is still disabled, or if iTunes does not automatically sync your device, sync the device with iTunes. If you have chosen to encrypt your backup, it will contain the passcode. Disable backup encryption before restoring from backup. Learn more about iOS backups in iTunes. When the backup and sync is complete, select Restore from Backup and choose the most recent backup of your device.

how do i restore funchion

Using the Restore function for your device is part of standard troubleshooting procedure. Restoring your device will delete all the data from your device, including songs, videos, contacts, photos, calendar information, and any other data. All settings are restored to their factory condition.
Whenever you restore your device, Apple highly recommends that you perform a sync prior to restoring to back up any changes since your last sync. If you have movie rentals on the device, see iTunes Store movie rental usage rights in the United States before restoring.
Use the following steps to restore your device:

1. Make sure you have the latest version of iTunes installed and running before attempting to update.
2. Connect your device to your computer.
3. Select your iPhone, iPad, or iPod touch when it appears in iTunes under Devices.
4. Select the Summary tab.
5. Select the Restore option.
6. When prompted to back up your settings before restoring, select the Back Up option (as seen in the image below). If you have just backed up the device, it is not necessary to create another.

1. Sync the Zune with its "home" computer. Each Zune has a specific "home" computer that it automatically syncs with. Use your Zune-specific USB cord to connect your device to this computer, and then sync your device as you normally would. This will solve most software hiccups and will generally get your Zune out of a "frozen" state.
2. Perform a soft reset. If syncing your device doesn't work, you can reset your software by holding the "Back" and "Up" buttons on the central control pad. Your screen will flicker, and then the Zune logo will appear with a status bar. Within a few moments, your software should be returned to normal.
3. Perform a system restore. However, doing this will erase all of your music, videos and photos, so only do this if you have exhausted both of the other troubleshooting steps. You can restore your Zune by connecting it to your computer, selecting it from the "Devices" list, and then pressing the "Restore" button. The process may take a few minutes, depending on how much content you had on your device. Once the restore has finished, your Zune will be completely blank.

Sometimes you need to restore the iPod even though you've already deleted the content. Below I have posted a step by step for restoring your iPod touch in iTunes. If you are still unable to sync the iPod after restoring please do let me know :)

Last Modified: February 16, 2009 Article: HT1414 Old Article: 305744 Using the Restore function for your iPod touch is part of standard troubleshooting procedure. Restoring your device will erase all data from your iPod touch, including songs, videos, contacts, photos, calendar information, and any other data. All iPod touch settings are restored to their factory condition.
Whenever you restore your iPod touch, Apple highly recommends that you perform a sync prior to restoring in order to back up any changes since your last sync. If you have movie rentals on the device, see this document before restoring.
Use the following steps to restore your iPod touch:
Make sure you have the latest version of iTunes installed and running before attempting to update. Connect your iPod touch to your computer. Select your iPod touch when it appears in iTunes under Devices. Select the Summary tab. Select the Restore option. When prompted to back up your iPod touch's settings before restoring, select the Back Up option. If have just backed up the device, it is not necessary to create another.
Select the Restore option when iTunes prompts you (As long as you've backed up your device, you should not have to worry about restoring your iPod touch).
Once the restore process has completed the iPod touch restarts and displays the Apple logo while starting up

I would try restoring your ipod using itunes. Below i have posted a step by step on the restore just in case you aren't familiar with it already. I hope this resolves your issue. CHHERS :)

Last Modified: February 16, 2009 Article: HT1414 Old Article: 305744 Using the Restore function for your iPhone or iPod
touch is part of standard troubleshooting
procedure. Restoring your device will erase all
data from your iPhone or iPod touch, including
songs, videos, contacts, photos, calendar
information, and any other data. All iPhone or
iPod touch settings are restored to their factory
condition.
Whenever you restore your iPhone or iPod touch,
Apple highly recommends that you perform a sync
prior to restoring in order to back up any changes
since your last sync. If you have movie rentals on
the device, see this document before restoring.
Use the following steps to restore your iPhone or
iPod touch:
Make sure you have the latest version of iTunes
installed and running before attempting to update. Connect your iPhone or iPod touch to your
computer. Select your iPhone or iPod touch when it appears
in iTunes under Devices. Select the Summary tab. Select the Restore option. When prompted to back up your iPhone or iPod
touch's settings before restoring, select the Back
Up option (as seen in the image below). If have
just backed up the device, it is not necessary to
create another.
Select the Restore option when iTunes prompts you
(As long as you've backed up your device, you
should not have to worry about restoring your
phone).
Once the restore process has completed the iPhone
or iPod touch restarts and displays the Apple logo
while starting up