Download iOS6 for iphone, ipad and ipod touch and update iOS to latest iOS6 on iphone, ipod and ipad. Now that your iDevice is running latest operating system from Apple, next step you would want to do is to jailbreak iOS 6 and install Cydia. By using Redsn0w you can jailbreak iOS6 and install Cydia on your iDevice. Here is how.
HTC Thunderbolt is one of the toughest device to root. The XDA developers team member dbzfanatic has developed a utility Easyroot + S-Off that makes Thunderbolt root process very easy. This will only work with firmware versions lower than version 1.12.605.9.