iphone 1st generation 2.0 update?

Hi i have a 1st generation iphone and i want to know how i can update it to 2.2.0 without losing my unlock/jailbreak. i want to update so i can add sources to cydia. Oh and btw i bought it from pakistan so it is factory unlocked.

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Btw, cydia, factory, generation, iphone, jailbreak, open, open question, Pakistan, question

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1. If I update my iPhone to the new software, 3.0, will I have to re- jailbreak it and re-unlock?
2. True or False: iPhone 3.0 Software Update will not work with 1st Generation iPhone?
3. why wont itunes recognize my iphone?

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