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I looked at your vid a few times. not sure what your trying to resolve?.. here this will help you with radio setup..http://img.banggood.com/file/products/20151222032156FS-i6S%20User%20Manual.pdf
also a radio will beep when low voltage is on..change remotes AAs..
when I have a motor that turns the wrong way on brushless I just change 1 wire. brushed just change polarity. I don't know if that helps your case just a thought though
I also go to whatever channel the wrong direction is and switch directions there like ch4 th from forward to reverse.. or vis versa.
in main menu it should give you a channel assign or similar, go there and chose channel you want then you can change from linear 2 way 3way or reverse