So, if you have another PC or Mac, I suggest you to try on that computer first. In order to prevent firmware restores Apple only signs one firmware version at a time, which is obviously the latest firmware version available. October 28, at 4:

Today the Chronic Dev-Team released their jailbreak utility called Greenpois0n. Not work for 3GS still have 29 error.

Downgrading your iPhone, iPod Touch or iPad to a lower firmware version is indeed possible, but unfortunately has become harder and harder over the years. If you happen to encounter any complications during the jailbreak process, then you might be needing iREB. Rodrigo Galiano March 13, , 8: