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On checking the specification for your device here, it appears Flash is not supported by the browser, its referenced under notes at the bottom "*13 Recorder's web browser doesn't support flash & some characters' set (e.g. Chinese etc.). Some features of websites may not be available on the web browser."
For this reason you will be unable to view pages which use Flash, or be able to install Flash on the device.
There isnt really a workaround, many other devices such as IPads suffer from the same problem.