iPod syncing difficulties (error 1675, iPod ejects when iTunes is open)

First of all, if you're using Windows 10 then you should be using that most recent version of iTunes, not one as old as 12.7. In fact, you shouldn't be doing so on a Windows 7 machine either (read more below).

At the time of writing, the most recent version of iTunes for Windows 10 is 12.12.9.4, but note that this cannot be installed on a Windows 7 machine. (The most recent version of iTunes that can be installed on Windows 7 is 12.10.11.2.) The problem with attempting to use an older version (on either computer) is that your iTunes programme may not recognise an iPod that has been synchronised with a newer version of iTunes.

Next: if you were synchronising the iPod with iTunes on a Windows 7 PC and then attempted to Sync it with a different iTunes Library (on your Windows 10 PC), that is why it was seen as a "new" iPod. (It means new to this iTunes, not new as in just purchased.)

Third point: if you managed to copy or get the music off an iPod, it will be in an unreadable form. iTunes will not be able to play it or add it to any iPod. There is no method whereby iTunes can copy music from an iPod into an iTunes Library. The only way to recover music from an iPod is via a third-party application. See this tip from fellow user turingtest2, which tells you more and has links to such apps: Recover your iTunes library from your iPo… - Apple Community.

Fourth point: it sounds to me as though the data on your iPod has now become corrupted and therefore unreadable by the iPod.

To move forward: you need to stick with one computer only, preferably the Windows 10 one.

1. 1. get that iTunes working properly, even if it requires uninstalling and reinstalling iTunes
   2. add your music to the Windows 10 iTunes Library* and make sure that it playable by iTunes
   3. once you have the iTunes Library in acceptable state, Sync the iPod with it. You will have to accept the "set up as new" procedure, which also means setting up Sync options from iTunes to this iPod (which you can view in iTunes on the Device/Settings/Music pane)
   4. you may need to use the iTunes Restore feature to put your iPod back into a working state. You can do that between steps 2 and 3 above. You do not need to have the music in the Library to restore an iPod

* To put your music into the new iTunes Library, copy the entire Music folder on the Windows 7 machine to the Music folder on the Windows 10 one. The Music folder contains iTunes control files, such as the .itl file, so hopefully you have not delete that file. If you have, look in the recycle bin and see if it can be restored to its original location.

MJL228 wrote:

2) the iTunes music library is empty, although all of the music files are saved on the machine in the music folder.

If the files are the ones that you mentioned before, i.e. copied from your device onto your computer, then I think you will find that you have series of folders named with four characters. I'm not certain what the actual files look like in the folders, but if you double-click one then one of two things will happen:

1. 1. if it's a recognisable audio file, your default music player )probably iTunes) will play it and the song will be added to your iTunes Library
   2. you will see a message asking you which programme you want to use to open the file (or a specific error message)

I suspect that the file will not open.

What you do now:

• copy the entire contents of the Music folder on your old machine (it should be where all the audio files are) and paste it into the Music folder on the Windows 10 machine. (Yes, with a thumb drive that is large enough to hold everything that you copy.) Somewhere in one of the sub-folders that you copy is the iTunes .itl file, which will be required by your new iTunes Library (on the Windows 10 PC)
• open iTunes. Your library should then have all the music you had on the old machine, because you have copied both the music files and the iTunes control files (that tell iTunes about playlists, play counts , ratings etc.)
• confirm that the music plays in your iTunes library

Also, it sounds like you're suggesting to do all that prior to connecting the iPod to the windows 10 machine at all.

Yes

• connect the iPod to your library and tap the iPod icon once it appears

• using the screenshot below, set Sync options on the Device/Settings/Music pane (1.)

• if, during these steps, you see messages about deleting the content of the iPod, that is because you are connecting the iPod to a new library. Since all the music is in your new library, your iPod should be populated with everything you expect
• tap the Sync Music button (2.) so the tick appears (check mark)
• for step 3, choose either:
  • entire music library, which will add all the music in your library to the iPod. (Note that the sections numbered 4 will not be displayed)
  • selected playlists, artists, albums and genres, which will then display the sections numbered 4, where you can select only the items that you want on the iPod
  • tap the Sync (or Apply) button for these settings to take effect

So the iPod cannot be used for the purpose of transfer?

Correct.

I believe that you should use the Windows 10 machine, not Windows 7. This is because if a later version of iTunes has added something to the iPod's control files that the older version of iTunes on your Windows 7 machine cannot process, then that might explain why the Windows 7 machine is unable to fix the iPod

My recommendation has been to use the Windows 10, with the latest version of iTunes. I believe that is the most suitable method of regaining use of your iPod. Further, I specifically think that if you use the Windows 7 computer, it leaves room for uncertainty about whether the iPod will be fixed.

Finally, all I can suggest now is that you review this entire discussion and see whether you spot any information in it that you have previously missed.