It was famously used to fix Error 1600, 1601, 1602, 1603, and 1604 during the restoration process.
The user would follow on-screen instructions to enter DFU mode.
The rc3.zip package was a small, portable tool that didn't require heavy installation. Is "Extra Quality" Legitimate? ireb+40x+41+421+rc3zip+extra+quality
Once the device was pwned, the user could open iTunes and "Shift+Restore" to select their custom 4.0.x, 4.1, or 4.2.1 firmware.
It focused on devices with the S5L8900 chip, such as the original iPhone and iPod touch, and newer S5L8920/S5L8930 chips (iPhone 3GS/4). It was famously used to fix Error 1600,
In the context of software downloads, terms like or "full version" are often added by third-party file-sharing sites to attract clicks. However, iREB has always been a free, open-source utility.
Verified legacy versions are often hosted on community archives like The Apple Wiki . How to Use iREB (Historical Context) Is "Extra Quality" Legitimate
iREB would "pwn" the device using exploits like limera1n or steaks4uce .