2009년 1월 27일 기준으로 iPhone OS 2.2.1 버전용 SDK를 사용할 수 있습니다.
자세한 사항은
http://adcdownload.apple.com/iphone/iphone_sdk_for_iphone_os_2.2.1__9m2621a__final/iphone_sdk_for_iphone_os_2.2.1readmefinal.pdf
을 참고하시기 바랍니다.

기존의 XCODE를 지우는 방법은 아래와 같습니다.

$ sudo <Xcode>/Library/uninstall-devtools --mode=all

그에 발맞추어 iPhone Dev Team은 2.2.1 펌웨어에 버전에 맞는 Unlock & JailBreak 프로그램을 배포하였습니다. 
(http://blog.iphone-dev.org/post/74278878/close-the-stable-door)

Mac PwnageTool

• http://iphone-dev.fgv6.net/PwnageTool_2.2.5.dmg
• http://iphone.schwarzmetall.cn/PwnageTool_2.2.5.dmg
• http://rabstalk.bplaced.net/mirrors/pwn ··· .2.5.dmg
• http://jmcoon.net/PwnageTool_2.2.5.dmg
• http://downloads2.ipod.backshot.eu/PwnageTool_2.2.5.dmg
• http://www.iphone-storage.de/PwnageTool_2.2.5.dmg
• http://miphone.ca/iphone-dev/PwnageTool_2.2.5.dmg

Mac QuickPwn

• http://iphone-dev.fgv6.net/QuickPwn_2.2.5.dmg
• http://iphone.schwarzmetall.cn/QuickPwn_2.2.5.dmg
• http://rabstalk.bplaced.net/mirrors/QuickPwn_2.2.5.dmg
• http://jmcoon.net/QuickPwn_2.2.5.dmg
• http://www.iphone-storage.de/QuickPwn_2.2.5.dmg
• http://downloads2.ipod.backshot.eu/QuickPwn_2.2.5.dmg
• http://miphone.ca/iphone-dev/QuickPwn_2.2.5.dmg

Windows QuickPwn

• http://miphone.ca/iphone-dev/QuickPwn225-2.zip
• http://foskarulla.com/QuickPwn-225-2.zip
• http://downloads2.touch-mania.com/QuickPwn-225-2.zip
• http://www.applei.ph/devteam/QuickPwn-225-2.zip
• http://phonenews.com/phones/gsm/apple/QuickPwn225-2.zip
• http://rabstalk.bplaced.net/mirrors/QuickPwn-225-2.zip
• http://www.evil-crew.de/QuickPwn-225-2.zip
• http://daniel14.com/QuickPwn-225-2.zip