I don't believe you will be able to officially update. My understanding is that you have to be on 2.3.15 in order for the phone to accept the OTA. I posted something similiar so hopefully someone smarter can correct me.
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You are correct. In order to receive the ota, you cannot be on the leak or on a custom rom. You have to be on stock froyo with all of that disgusting bloatware
(hope you made a backup or you will have to sbf) just not sure if you have to unroot but I'm sure the ota will take care of that for you
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