You don't need to worry about the supporting letter. After approval, it is highly impossible that whithdraw of your boss' supporting letter will invalidate your EB1 I140. I don't think your boss will do the withdrawing things. In doing that, your boss will also hurt himself.
You can transfer the I485 from EB1 to NIW.
You can transfer the I485 from EB1 to NIW.
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