: Right-click the extracted executable application and select Run as Administrator .
In 2010, Apple significantly tightened its security. When users tried to restore their iPhones (2G, 3G, 3GS, or 4) or iPod Touches to (IPSW) using iTunes, they were frequently met with "Unknown Error" codes, specifically 1600, 1601, 1602, 1603, and 1604 . iREB 4.0.x 4.1 RC2.zip 1
: This version eliminated the need for the libusb driver, making it easier to run on standard Windows environments. iREB 4.0.x 4.1 RC2.zip 1