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The IREB Download Center provides free, official materials for all certification levels, including:
: Be extremely careful downloading files with names like rc3.zip from unofficial sites, as legacy jailbreak tools are frequently bundled with malware on third-party file-sharing platforms. ireb 40x 41 421 rc3zip link
This was a significant update that added support for all iOS 4.2.1 devices. The IREB Download Center provides free, official materials