Instructions say nothing about firmware or arming,,, nothing! According to what I have been able to find out about it, it is supposed to be ready to go with just a few settings with an on board push of a button. Once it is turned on and self calibration is established, the blue light is steady,,, it's armed and active.
Doesn't sound like the safest FC on the market,,, Just from a personal experience, I have a nice cut to the bone on my finger because I was out flying about with my quad. I landed, then reached down to pick it up and as I reach over it, the thing spun up and began chewing on me fingers.
I neglected to disarm before I reached down to get it,,, Me fat belly (as I bent over) brushed the throttle up and ,,,,, all I herd was me quad saying "YUMMY FOR ME".
I am all about safety, yet I do make the occasional mistake.
An arming feature is a necessity at the very least!
I'm putting this thing in my junk bag and save it for later on another project!