I think it is risky to completely drain the battery because some users had trouble charging after that. That should not be the case of course but it is never good to completely drain, and the tiny fitbit battery may be especially sensitive to doing that.
I had a bootloop issue with fitbit logo repeatedly showing. I let it loop for a while and then managed to reset using the instruction of repeatedly pressing the button at the right time, and it worked after a couple of tries.
The main trick is not to give up. You have to get the press timing right. I don't think it has to be done repeatedly, just twice probably, with good timing. Do it twice and wait to see if it worked. If not, let it loop again and try again. Yea it is ridiculous but probably it will eventually work.
***The other thing I did is turn off the bluetooth on all devices (laptop, phone, unplug FireTV stick...). Because I think the loop is due to trying to connect to bluetooth and failing, maybe. Good luck everyone, don't despair. It will almost certainly resurrect eventually.
