Install iOS 5 on iPhone

iOS 5 comes up with the whole new baseband version so upgrading via iTunes would not be a good idea for people who rely on unlocking of the device via ultrasnow (means using the not supported carriers as well). Presently only tethered jailbreak of all the devices on iOS 5 is available (menas you have to connect your device with the PC and boot with ibooty it will only then boot). So if you are ready to do this continue reading otherwise you can read it for knowledge of the same.

Ok so letz get started. So firstly you will need some softwares:-

1. iOS 5 ipsw file get it from here.
2. snowbreeze for iOS 5 get it from here.
3. redsnow for iOS 5 get it from here. for Windows and for mac.

first of all start snowbreeze and then put the ipsw file of iOS 5 into snowbreeze (by drag and drop or by locating the file) then build the ipsw. Snowbreeze will save your modified file on the desktop.
Now open iTunes and then keep pressing shift on the keyboard and then press restore button in iTunes and locate the file which is saved on desktop (snowbreeze modified). Software will install and then run redsnow. Now jailbreak as per instruction on redsnow and there it is ready to go ....