Install new language


I just bought a Forerunner 45S in US and come back to Vietnam. All the message in Vietnamese (Roman type, not like Chinese) show as square symbol. Therefore, i want to change language to Vietnamese. But it's not in the list.

I use Garmin Express connect to my watch, and in "Language files" there are no additional language files available to install.

Does anyone help me please?

P/S: firmware in my watch is 3.40