Hi I have a 1st gen iphone that is unlocked and jaibroken using 2.0 . I use tmobile and have the $5.99 data plan. I would like to upgrade to 3.0 or higher. I have a imac g4 version 10.4.11 computer. I have itunes 9 on the computer. I bought the iphone unlocked and jailbroken with 1.1.4 then had it upgraded to 2.0. Have cydia on my iphone. Any one have any step by step way of upgrading. Don't want to lose my unlock and jailbrake and have a brick. Thanks .