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To successfully bypass iTunes errors using iREB, follow these preparation and execution steps carefully. Step 1: Requirements and Preparation

Created by prominent developer ih8sn0w, this tool puts iOS devices into a pwned DFU (Device Firmware Update) state. It patches the low-level bootloader environment (iBoot or SecureROM) so it ignores the digital signatures usually verified by iTunes. ireb+40x+41+421+rc3zip+extra+quality

What you are working on (e.g., iPhone 3GS, iPhone 4)? To successfully bypass iTunes errors using iREB, follow