-You don't need to do it again, and just provide the copy of the birth certificate again (both Chinese version and English version) which you have provided for the I-485 filing, but you need to ask your friend to translate it again because USCIS do not trust the original translation version due to absence of the statement from the translator to certify that she or he is competent to perform the translation and the translation is completed and accurate.
See my above responses to your previous questions and the links I cited for you to ask the translator to translate the document and make the statement.