The urge to know more about iCloud made me ponder whether I could go ahead and install the iOS 5 beta on my phone. Since I knew that there was support for the iPhone 3GS, it was time to fuel that urge further. So I googled about and found a website that shared the iOS firmware.
The point here is that to install iOS 5.0 beta 4 version, you also need the corresponding iTunes 10.5 version. With some luck I could find it here and here respectively. (hotlinks to this page won’t work)
You must carefully note that this link is for 3GS so if your phone is different read that homepage fully before making a download choice.
Installing iTunes was no difficult. Once done, its the normal procedure of putting the iPhone in DFU mode to start loading iOS 5 firmware. This link explains the steps better.
To continue further, click here :