This usually indicates a corrupt download. Delete the folder, re-download, and re-extract.
Released in July 2021, r31.0.3 was a minor but significant update that ironed out major bugs from the r31.0.0 and r31.0.2 releases. For Windows users, this version represents a sweet spot—offering modern support for Android 12 and 13 while maintaining compatibility with older Windows 7, 8, and 10 systems. platform-tools r31.0.3-windows
For Windows users, r31.0.3 offers a rare combination of reliability, compatibility, and speed. It handles large fastboot flashes without corruption, maintains stable ADB connections over USB 3.0, and supports older device drivers that newer releases have abandoned. This usually indicates a corrupt download