Many thanks to all you guys again. Especially TA-t3. I successfully upgraded my N800 yesterday.

The problem was the dotnet framework. I again reinstalled dotnet and again installed nokia driver in my pc. Then when i do this upgrade process, it found the device and i was able to upgrade.

So thanks to all of you guys who helped me.

But now i would like to ask this new question.

I upgraded to new firmware on N800. Installed microb. But i am not able to see an engine to choose opera below close . Can anyone help me how can i get that option ????? Plsss