Can I Update to iTunes 8.1 With a Jailbroken iPhone?
Our sources have updated to iTunes 8.1 without affecting the iPhone 2.1 jailbreak at all. In fact, performance during the sync process has improved dramatically. The iPhone backup is faster than ever using iTunes 8.1.
No news or advice has been posted by the iPhone DevTeam on this subject. Other reports indicate that the iTunes 8.1 update does not include new countermeasures from Apple against the iPhone 2.1 or 2.1.1 jailbreak. The software does include some interesting new features, however.
A new version of the Party Shuffle feature is dubbed iTunes DJ, and now allows iPhone or iPod Touch users with the Remote app to influence the music at parties through requests and voting. Other performance improvements include better handling of large music libraries and faster browsing of the iTunes store.