Hey everybody !
I have some good news right there.
I contacted LG's support through lgappstv.com.
Here's a screenshot of my question and their response.
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I'm sorry that it's in french.
Here's a translation.
Here's my question :
And here's their response :
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According to this website, the 47la620s was released around March 2013.
That's sounds pretty good, huh ?