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iTunes is telling me there's updated iOS firmware available (4.3.5) for my iPhone 3GS.

I've synced the iPhone to iTunes already. Repeated the sync several times.

Regardless of this, every time I go to apply the firmware update I get the following warning from iTunes:

iTunes Purchased items warning

I'm uncertain how this can be as I've most definitely completed a successful sync. How can I figure out what remains un-synced from my iPhone to iTunes so I can resolve this and apply the firmware update?

Edit: I'm not interested in whether I can safely ignore this warning and apply the iOS upgrade. I want to know how I figure out what's triggering the warning. What content does iTunes identify as unsynced?

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up vote 2 down vote accepted

Try going to File -> Transfer Purchases.

That way you know for sure the purchases have been transferred over.

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Done. But I still get the warning message from iTunes when I click the Update button to apply the new firmware. – Ian C. Jul 26 '11 at 19:05
Well, as long as your transfers are over just go for it. As of right now all music, apps and books can be re-downloaded thanks to iCloud so you won't be losing any of that. The only thing you might be losing is videos. So make sure you have all of those backed up before going ahead with it. – Chris Jul 26 '11 at 19:08
You've missed the point of the question I'm afraid. It isn't whether I can safely ignore this warning, but how I go about finding the unsynced content that's triggering it. – Ian C. Jul 26 '11 at 20:26
Do you get any errors or warning after "transfer purchases" completes? – zevlag Jul 26 '11 at 21:06
@zelag: no errors. Says it completed successfully. – Ian C. Jul 27 '11 at 2:44

Don't have the privilege to comment on Chris' answer, so posting here (I agree that Transfer Purchases should do it). You could always check your purchase history in iTunes and your emailed receipts for purchases and compare this against the actual items in your library, but that's a lot of work. Maybe it's worth doing just for your most recent purchases. (The history in iTunes for multiple items purchased on the same day only lists the first few purchases, so the list in iTunes may not be complete without the receipts they mail you.)

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