You’ll have to read through and decipher if this update applies to you but the Dev-Team has released Pwanage Tool 3.1 for the iPhone 3GS and iPod Touch 2G.
Using Pwnage Tool 3.1 you can upgrade your iPhone 3GS or iPod Touch 2G to firmware 3.1 as long as your device is currently running a custom (jailbreak) 3.0 or 3.0.1 firmware.
Those of us who are not able to jailbreak because our phones shipped with 3.1 or hastily ran the update to 3.1 and can’t go back will have to wait a while longer for freedom.
On Monday, Cult of Mac release a handy and complete guide to jailbreaking your device, which can help you use this newly released Pwnage Tool to update your device.
