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Sacado de un foro de samsung, despues de cambiar el local set a "EU_SPAIN", que supongo ya lo habras hecho, luego haz esto, por si es diferente a lo que has hecho hasta ahora
Select TV as source
Press Menu on the remote
Select System
Select Setup (If you are unable to enter Setup go to Support > Self Diagnosis > Reset)
Continue the set up
Stop the setup when you come to the Smart Hub Terms & Conditions, Privacy Policy page and position yourself on the " I accept the general conditions blah blah blah field" where you have to tick the box
Press the following sequence on your remote
MUTE - RETURN - VOL+ - CHAN + - MUTE
Select the country you wish to receive apps from.
Once you have selected the country let the setup complete