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You don't. If type is converted to outlines it is done to maintain appearance. Your only option is to reset the type and delete the outlines if needed. There is no way to un-outline type in Illustrator, other than using Undo if you outlined the type yourself.
Although your question is unclear, most probably in your case Live font was meant as a reference to "editable text", or even the opposite: "text with preserved appearance" in your document/design.
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