Is USCIS premium processing available for change of status from H4 - > H-1B1 visas?
Yes, but for an H-1B1, the fastest would be to apply directly at the US Embassy in Singapore/Chile.
Your employer needs to retain an experienced immigration lawyer to review all the facts, advise them, and handle the case. Your employer can find one through http://www.ailalawyer.com.
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