All this seems incredible to me. Lots of users complaining about the same thing and you (blackview support) asking for videos in all threads of the forum (it seems that you copied and pasted the message), I'm not very clear why.
If in a few months you have stopped supporting R7 what you have to do is to say it clearly.
Hi, I bought it in July 2016 and the last update was in August 2016. I think that with the amount of problems that the smartphone has (wifi, gps ...) it is embarrassing that they have not yet been remedied.