What are you trying to use this with?
The "Ifast" utility is typically used for low-level communication with flash storage devices. It is often utilized by technicians to: on industrial-grade SSDs or CF cards. Run diagnostic tests to check for bad sectors. Ifast-22.exe Download UPD
Ensure you have the correct USB-to-Serial or storage controller drivers installed, or the software will not "see" your device. What are you trying to use this with