Need info on updating

[b00ty_m4n]

OK I have a milestone a 854 version 2 update1 and I am rooted OK! How do I update it not to a custom ROM but to 2.2 or 3.0 or just whatever is better than what I have it is what came on it and don't really want to go to a custom ROM just update what came on it to the most recent update out how do I do this??

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