Hello olgahdb,
It sounds as though iTunes is prompting that the iPod touch needs to be restored. If so, the steps listed below walk through placing your iPod touch in to recovery mode, and updating or restoring your device. These are the specific steps to follow to resolve this issue and can also be found in the following article.
- "Make sure that your Mac is up to date. If you're using iTunes, make sure you have the latest version of iTunes.
- On a Mac with macOS Catalina or later, open Finder. On a Mac with macOS Mojave or earlier, or on a PC, open iTunes. If iTunes is already open, close it, then open it again. Find out which macOS your Mac is using.
- Keep your device connected and wait until the recovery mode screen appears:
- iPhone 7, iPhone 7 Plus, and iPod touch (7th generation): Press and hold the top (or side) and volume down buttons at the same time. Keep holding them until you see the recovery mode screen.
4.Locate your device on your computer. When you see the option to Restore or Update, choose Update. Your computer will try to reinstall the software without erasing your data. Wait while your computer downloads the software for your device. If the download takes more than 15 minutes and your device exits the recovery mode screen, let the download finish, then repeat step 3.
5.After the Update or Restore completes, set up your device."
If you can't update or restore your iPhone or iPod touch - Apple Support
If the issue is with your iPod touch not being recognized by iTunes and you're not seeing any error message, you'll want to complete the steps outlined in the following article. These steps are specific to resolving issues with your iPod not being recognized by iTunes on a Mac or PC.
If your computer doesn't recognize your iPhone, iPad, or iPod - Apple Support
Let us know how that goes!