AI-generated summary
**Steps:**
1. Install an older version of QQ Music (19.43 or earlier) and re-download song files.
2. Download um-web.legacy.v1.10.5.zip to crack mflac format, then extract and open index.html.
3. Upload the mflac files to the webpage, wait for the cracking process to finish, and download all.
4. Use Format Factory to convert the flac files to mp3 for use with speakers or car USB drives.
**Reference:**
Unlock Music Project (unlock-music.dev) - Usage tips.