The RUU is the program that upgrades your phone. But before we go any ferther I recommend you do some resurch and home work to learn more about what things are what they mean and so on, just do searches in hear because there are all ready a ton of posts that cover all that stuff. Im saying this to you because you realy need to know what you are doing before you attempt this, I learnd how bye asking Qs: tryle and error, and reading post in hear, its not as bad as it sounds. hear is a link to what mostly everyone is using:
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Apache WM6.1 Kitchen CE OS 5.2.19716 (Build 19716.1.0.0) - UPDATED 20080308 One other thing please ask Qs: BEFORE u do somthing your unsure of, good LUCK!!!!!