C7-00 cannot read video because it require a latest version of Flash Player.
Where can I download a flash player compatible with Symbian S60
The C7-00 comes with Flash Lite 4.0 built-in. There is no user-installable newer version.
If Nokia releases a newer version, then it will come with a firmware update.
Note that Flash Lite is not quite compatible with "full" Flash that many web sites use (hence the "Lite" in the name), but also some web sites detect what device/browser is connecting and redirect unknown browsers to an error page sometimes unnecessarily (they might be able to handle the content fine, but the site developer doesn't know it, or hasn't tested it, or doesn't really understand what they're doing and why).