Update 2G unlocked iphone from 2.2.1. to 3.0.?

Update 2G unlocked iphone from 2.2.1. to 3.0.?

I want to update my 2G unlocked iphone from 2.2.1. to 3.0. What’s the best way to keep it unlocked and update it?
I can’t remember if I used Pwge tool on the mac or Quickpwn on the PC so how should I update with least problems?

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