Because iREB is a legacy tool from the early 2010s, most official download sites (like ih8sn0w.com ) are no longer active or have moved.
Download a trusted copy of the archive and extract it to your desktop. ireb 40x 41 421 rc3zip link
solves this by putting the device into a "pwned DFU" (Device Firmware Update) state. Because iREB is a legacy tool from the
If you are looking to jailbreak older devices, this is the most reliable tool for bypassing the common errors encountered in iTunes. ireb 40x 41 421 rc3zip link