What are the requirements for a judge to approve an amended finding and recommendation in a civil case?

These amended findings and recommendations are submitted to the United States District Judge assigned to the case, pursuant to the provisions of 28 U.S.C. 636(b)(l). Within 14 days after being served with these findings and recommendations, any party may file written objections with the court. Responses to objections shall be filed within 14 days after service of objections. Failure to file objections within the specified time may waive the right to appeal. See Martinez v. Ylst, 951 F.2d 1153 (9th Cir. 1991).