Hey everyone, this is my first post, and I am just getting into FPV drones so any help would be amazing. I recently bought a Diatone MXC Taycon Cinewhoop and didn't even get to do a first flight before encountering issues. (Video posted of the issue) 

My latest problem that I am absolutely stuck on is that one of my motors isn't working while the other three are working great. I know that one motor isn't dead because I can feel the first 3 buzzes it makes, but then it fails to make the last 2 buzzes. All of the other motors work with no issue. I know it's an older model, and I've watched some YouTube videos that could be helpful, but I did not find any answers besides a video posted by Joshua that outlined a software issue that caused the ESC to not connect to the 4th motor. It was however for a different board and I am clearly not lucky enough to just find "To have motor 4 work use this target and software" like he did lol 

I have included a picture of the components of the drone and the current software I uploaded to it using Betaflight. Any help would be amazing, and I am also willing to pay $10 to anyone willing to walk me through this over the phone. (Willing to do 20 if we get it to work and it takes longer than 30 mins of your time)