sorry one more thing. I found this on the net:
You can always flash same firmware in various countries however, keep in mind you shouldn't attempt flashing a carrier branded firmware on other countries. For example, you can install a firmware that rolled out for Hungary in Uruguay but you can't flash Hungary (VDH) firmware when your country is Uruguay.

means that on my tablet I can't install a different rom of US rom (T320UEUU1ANAG or more updated versions)??