super noob needs help

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http://androidforums.com – ok so i'll admit. i'm a total super n00b when it comes to these things. I bought a captivate a year and a half ago or so when i was still living in america. i'm teaching in china now. before i left i had att unlock the phone so i could use china mobile. worked great. have a china mobile sim card been using perfectly. well here i am six months later and my phone froze up and when i restarted it, it wanted the unlock code again. att has been no help. at all. so i figured i would root my phone and see if that would work. well i downloaded the zip file, renamed it, loaded on my phone, followed al (General)