Corrupted MP4 Video File Repair

I'm in need of some tech-savvy assistance. I recently encountered an issue where a crucial MP4 video file became corrupted. This occurred when I made some alterations to my system; the video file has been unresponsive since then. - The best person for this job would have substantial experience in handling corrupted video files, particularly MP4 format. - Familiarity with various video file recovery software is paramount. - An accurate understanding of system changes impacting video file functionality would also be beneficial. Your role would be to recover this video file for me, ensuring it's back in good working order.