I have an unlocked iphone 3gs using it on Tmobile network and would like to update NOT to the very latest software which I think is like 4.3.5 or someting around those lines. How can I update my iphone without loosing the unlock portion of it. I have cydia on it. All I ask is if someone can guide me thru it so I can do it, Im not too techy but given the correct instructions I can follow them to the letter. Thank you all this is my first ever post on here, hope someone would be kind enough to help, please. Thank you so very much.