I'm working with Qt SDK that suddenly started to have a big problem: whenever I try to deploy and run my application on a Symbian device (Nokia C7 Belle with usb connection) it shows this error: Could not open serial device: The port COM4 could not be opened: Port in use .
I tried a different solutions to resolve: changed usb port, restarted my device, uninstalled Qt Creator removing old settings. I also notices that this problem happens with all applications (i tried to make a new app without any code change and run it.)
If I run the application on the simulator everything works fine.
Can someone help to resolve this problem?