Let me just tell you what actually Odin is?  It’s a Windows-based software that built for flash files like ROMs in Smartphone devices. Well, this software have not special requirements beyond the original USB cable (Android USB Drivers) of your smartphone device and can be installed on your computer right away.
Odin is one of best tool for updating or rooting smartphones. It would be a complicated task if you don’t use Odin tool. Odin is considered to be as one click rooting software, is most used and one of best software to change your smartphone ROM, or firmware.
When your phone have root privileges, you can do whatever you like with your smartphone. Odin 1.85 features a user-friendly graphic interface and is very easy to use.
WARNING:Â When you use Odin 1.85 software be careful about the changes that you are making. You must know what are doing in Odin because if you make wrong changes, you can damage your smartphone device.
Rooting any device offers a way to control over your phone in a way this give us a lot of advantages, but like you know no each of us needs it. When you want to update your smartphone, the updates come with series of new developments and new improvements, bug fixes and more features, therefore is really recommended to make updates , this updates can be unofficial ROM or an official, depends of you which you prefer to use them.
what is the latest Odin version ? according to odin download site thay have ,3.09 is it official?
Yes, Odin 3.09 is official.