The GM (Gold Master) release of iOS 4 for iPhone 3GS, 3G and iPod touch 3G, 2G has made its way on the popular file sharing and torrent sites. Unlike all the previous Betas, this release actually doesn't require registered UDID, and you can restore it on a Windows machine too but it will be pointless as for activation, you will still need iTunes 9.2 Beta which is currently only available for registered developers on Macs.
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.
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