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We have already seen iOS 4.0 Beta 4 (formerly iPhone OS 4) being successfully jailbroken and unlocked on iPhone 3GS and 3G using ultrasn0w and blacksn0w. But for this final release of iOS 4, both the tools are likely going to get an upgrade soon to make them full compatible. The iPhone Dev Team has already promised a full carrier unlocking solution sometime this month for 05.12.01 baseband. Geohot might also update blacksn0w unlock for this latest firmware, which has already been successfully ported to the Beta 4 of iOS 4.

Unlock iOS 4

While we don’t have the exact ETA on the release, what we know is that it will be arriving by the end of June, probably right after Apple has shipped first of iPhone 4 devices.

In the meantime, If you are on iPhone OS 3.1.3, you can follow our step by step guides to jailbreak iPhone 3GS with Spirit here, iPod touch 3G untethered here, and iPad on OS 3.2 here. You can also use redsn0w 0.9.3, redsn0w 0.9.4, sn0wbreeze, PwnageTool 3.1.5 to jailbreak iPhone and iPod touch. Unlocking can be done using ultrasn0w or blacksn0w.

For iPhone 3.1.2 firmware, you can use blackra1n, PwnageTool, redsn0w, sn0wbreeze, ultrasn0w and blacksn0w to jailbreak and unlock your iPhone and iPod touch.

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