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QtSysInfo returns wrong Symbian version (Known Issue)
Qt 4.6.3 shipped with initial Symbian^3 devices (for example; Nokia N8-00, Nokia C6-00) returned wrong information with QSysInfo::symbianVersion().
Qt on the device should be updated to 4.7.x. This can be done automatically by utilizing Nokia Smart Installer for Symbian (Nokia Smart Installer for Symbian).