I uninstall all the applications and still it says "To update your device to this version of the operating system you must use the Nokia software update application on your PC. Connect the device to your PC via a USB cable and launch the application."

What am i going to do? I can not believe my rootfs say only 33MB FREE after uninstalling all the apps...that is impossible. How do you restore to factory settings?? I don't know what to do.