iREB: This likely stands for a software tool or project name. Without specific context, it's hard to determine what "iREB" refers to, but it could be an acronym for a tool used in a specific industry or for a particular purpose.
iPhone: 2G, 3G, 3GS (both old and new BootROM), and iPhone 4. iPod Touch: 1G, 2G (MB and MC models), 3G, and 4. iPad: Original iPad (1st generation). Apple TV: Apple TV 2G. How iREB Works
Practical notes
Device Not Detected: Ensure you are using an older version of iTunes (like 10.x or 11.x), as modern versions often lack compatibility with legacy DFU protocols.
Updated GUI: Features a cleaner interface compared to earlier releases. How to Use the Tool Based on documentation from The Apple Wiki and UiP:
Connect your iPhone, iPod Touch, or iPad to your computer via a USB cable. Enter Pwned DFU Mode Extract the ZIP file and run the executable as an administrator.