Jailbreak iOS

List of updated iOS

Software Name	Release Date	Platform	Hardware	Firmware	Publisher
Sn0wbreeze 2.1 [56]	November 13, 2010[57]	Windows	iPhone 3G, iPhone 3GS, iPhone 4, iPod Touch 2G, 3G & 4G, iPad, Apple TV 2G	3.2.2 & 4.1 (Untethered)	ih8sn0w[58]
Limera1n RC1b [59]	October 9, 2010[60]	Windows, Mac OS X	iPhone 3GS, iPhone 4, iPod Touch 3G & 4G, iPad, Apple TV 2G	3.2.2, 4.0, 4.0.1, 4.0.2, 4.1 (Untethered)	Geohot[60]
Greenpois0n RC4 [1]	October 12, 2010[61]	Windows, Mac OS X and Linux	iPhone 3GS, iPhone 4, iPod Touch 2G, 3G & 4G, iPad, Apple TV 2G	3.2.2, 4.1 (Untethered)	Chronic Dev Team
PwnageTool 4.1.3 [1]	November 28, 2010[62]	Mac OS X	iPhone 3G, iPhone 3GS, iPhone 4, iPod Touch 3G & 4G, iPad, Apple TV 2G	3.2.2, 4.1 (Untethered) 4.2.1 (Tethered)	iPhone Dev Team[63]
redsn0w 0.9.7b4	December 31, 2010	Mac OS X	iPhone 4, iPod touch 4G, iPad	4.0, 4.1, 4.2 GM, 4.2.1 (Untethered)	iPhone Dev Team[64]

http://en.wikipedia.org/wiki/IOS_jailbreaking

How to JailBreak

http://www.applej4ck.com/jailbreak-tools/guide-jailbreak-unlock-ios-devices/ipod-touch/ipod-touch-4g/

Recommend: limera1n

http://www.applej4ck.com/2010/10/09/jailbreak-ios-4-13-2-2-with-limera1n/

Serial (Updated BootRom)

Example: xx050xxxxxx - the 0 means 2010, and the 50 is the week of 2010 that it was manufactured.

So according to the speculations, new iPhone, iPod Touch and iPad manufactured from the 50th week of 2010 might come with updated bootrom.

http://www.iphonehacks.com/2010/12/apple-may-have-patched-limera1n-bootrom-exploit-in-newer-iphone-ipad-and-ipod-touch-to-prevent-jailbreaking.html#more-3287

Change root password
openssl passwd -crypt -salt /s alpine
http://www.iphonehacks.com/2008/10/security-tips.html
http://www.ipodtouchfans.com/forums/showthread.php?t=46254