Default Portrait mode in Android TV Dongle (Measy U2A)

Hello!

I own Measy Android TV Dongle (U2A) with Jelly Bean inside.
Is there any way to force this device to display screen in portrait mode? I purchased it to display the content of specific website, which would be much better displayed if TV is hang vertically.

I have tried many apps available in Google Play store, but without any success, so maybe after rooting this device I shall be able to switch into portrait mode?

Thank you for your help in advance.