20120717:Update ipad2 iOS 5.1.1 by reading file from iTunes when iTunes auto-updates failure.

link:http://www.newmobilelife.com/2012/05/21/ios-5-1-1-firmware-direct-download-link/
JB1:http://www.newmobilelife.com/2012/05/25/ios5-1-1-jb-tutorial/
JB2:http://portable.easylife.tw/3119
JB3:http://kocpc.pixnet.net/blog/post/29931922-%E3%80%8C%E6%95%99%E5%AD%B8%E3%80%8Dios-5.1.1%E5%85%A8%E7%B3%BB%E5%88%97%E8%A3%9D%E7%BD%AE%E5%AE%8C%E7%BE%8Ejb%E5%AE%8C%E5%85%A8%E6%94%BB%E7%95%A5
iOS:http://ifree.soft4fun.net/ios-%E9%9F%8C%E9%AB%94%E4%B8%8B%E8%BC%89/
itools:http://blog.chinatimes.com/kocpc/archive/2011/11/02/1022268.html
Absinthe:http://www.soft4fun.net/ipad-iphone/about-jb/ios-5-1-1-jb-for-iphone-4s-ipad-2-new-ipad.htm