The other day I made the mistake of attempting to push a SJcam SJ4000 firmware update to my F23 action cam. I had a morbid curiosity, and a little bit of a destructive mindset. Needless to say that the SJ4000 hardware must be different in some way, as its firmware did not work on the camera.
On October 3rd, 2016, Amazon.com announced a terms of service update for its reviewers that affects everyone in a big way. Amazon announced that effective immediately incentivized reviews are no longer allowed on their service.