USBUtil is legacy software designed for the PlayStation 2 (PS2) era. Because it is an older "homebrew" tool, it is not digitally signed by modern security standards.
Below is the complete instructional text on how to safely download, install, and use the official software. 📥 How to Download & "Install" USBUtil usbutil v300 download install
Western Digital Firmware ZIP files
Look for legacy updates for WD My Book or My Passport from official WD support archives (e.g., WD_My_Book_Firmware_Update.zip). Extract the ZIP – usbutil v300 is often included as a command-line executable. Guide: USBUtil v3