When I connect my Palm Pre to pc with USB cable I get the option to just charge or to go in USB drive mode.
If I select the USB drive mode option the screen goes shows the big palm pre with the USB simbol but after a couple of seconds it goes back normal mode.

I have searched in the forums and on the internet but can't find a solution.
I just want to backup my partition because I want to install webos 2.1.0.

Can someone please help me to make USB drive mode work again?
I have also tryed on two different PC with two different OS (Win7 and OSX) and two different cables.

Novaterm works fine, but it is insane to copy 6GB of data file per file with novacom...

Thank you.
Francesco