We are answering all the wonders now. The popular iPhone hacker Sherif Hashim has just posted on his Twitter account that iTunes 10.1 is safe for already jailbroken devices with PwnageTool, Redsn0w, and almost all tools but don’t ever update your carrier.
iTunes 10.1 appears to be safe for already jb devices, also plays well with latest versions of redsn0w, pwnage tool and tinyUmbrella 🙂
So, go ahead and update your iTunes version or download iTunes 10.1 from here and now let’s wait for iOS 4.2 public release (may be on November 24th?), Stay tuned for this big news.