Blacksn0w

Geohot's runtime unlock for baseband 5.11.07 (used by the iPhone 3G & 3GS). blacksn0w exploits the AT+XEMN Heap Overflow, and can be installed via blackra1n or its Cydia repo (http://blackra1n.com/).

Installing

For previous Blackra1n users who kept the Blackra1n App: Load the App the click the option that says 'Ra1n' that replaces Icy. This will update the App. Then load Blackra1n App again and choose the 'sn0w' option to install. commcenter will be restarted and no power cycle will be needed.

For previous Blackra1n users who did not keep the Blackra1n App or used Redsn0w or something else to Jailbreak: Open Cydia or an alternative. Add http://blackra1n.com as a source and install Blacksn0w

For those who have not yet Jailbroken: Follow instructions to JB at the Blackra1n page then load the app and click sn0w to unlock