Been there, almost done that, as well. I have had mine for about 2 years, and it always worked flawlessly. It came with a dongle, which I dutifully inserted into an open port on my laptop, downloaded the app on the laptop, my tablet and my android phone. Life was good. Up until this past Nov. when it started notifying me that it couldn't connect, because it was connected to another device. After a while, it would connect, and all was good, again. It continued to worsen, began shutting down, requiring me to restart it. I got on the forum and tried all the tricks. Still, same results. By now it was Dec., and I was ready to throw mine against the wall, too. Instead, I just put it into the dreaded Drawer of Dead Electronics, thinking that it was now history. Blame it on Fitbit, and it's unwillingness to maintain a tracker that they no longer make (grrr - what a mistake, in my mind). And then it came to me like a bolt out of the blue! Windows had been doing some major updates to Windows 10 in Nov. and Dec. So, I removed the dongle from my laptop, uninstalled the app, and reinstalled the Fitbit app onto my android. I dug the One from the dreaded drawer, and it was on and running! With no assistance from me!!! It has been working fine since. So, in my case, it may have been the Windows updates that did the Fitbit system after all, and not Fitbit's negligence towards it now-orphaned One tracker. I no longer operate it on my laptop, which is no great loss. And it works, which is what counts. So, if you try something along these lines, you may get it working aain, too. Good luck.
