Solid white triangle following update

I just got an update but the watch restarted fine 

Could you upload a picture using this link of what you are seeing with the watch:

https://supportforms.garmin.com/form/file-uploader 

This will help us take a look at troubleshooting, please comment back in this thread once you submit a picture so we can take a look.

A user of my watch app has reported that it worked to start with on his new FR55, then suddenly started misbehaving ( RE: Problem with Accelerometer on Forerunner 55 ).   I wonder if this could be related to a firmware update - are the older firmware files available somewhere so he can try downgrading it to see if it starts working again (then I can work out if it is a firmware issue or a hardware failure that he is having trouble with).

Downgrading of firmware doesn't seem to be officially supported for Garmin watches, so doesn't appear to be any easy way to officially get older firmware files. You'll need to hope someone has a copy of an older firmware you want to try and then trust them enough to take the risk of trying to get it on it on your watch. See the following thread regarding the Forerunner 255, as an example.  forums.garmin.com/.../guide-to-downgrade-firmware

Thanks - I had feared as much because I hadn't managed to find a repository of firmware files. 

This is really frustrating because this is the second or maybe third model of watch that Garmin has effectively broken with a firmware update, and do not seem bothered about fixing....not fixing it wouldn't be so bad if you could downgrade to a working firmware!   I have moved away from recommending users get a Garmin watch to use with OpenSeizureDetector because of Garmin breaking the VenuSq, which I used to recommend....

I wouldn't have bothered buying a sports watch myself if i knew in advance that i would only just get over 3 years usable time out of it. Even if i leave it charging continuously for hours and only put it on just before my run, it still can't handle a GPS run longer than about 1 hour 10 minutes. The metrics with the watch are nice but i was doing ok for years with a 25 quid Casio stopwatch for timing, using the measurment tool on Google Earth for estimating distance and storing the data in the free to downloadl Sportstracker app on my laptop to monitor my progress. For info, Coros don't ofiicialy support firmware downgrade either. Not sure about other brands.

I'm surprised your battery life is so poor.   Ill regularly do 1.5 hours with my ForeRunner 245 (which must be over 5 years old I think) and don't worry about draining it's battery, so id expect it to do a few hours without trouble.   I think yours has a dud battery.....or Garmin messed up another firmware update on it.   I do think Garmin watches are excellent for running - their optical heart rate sensors are very good.....but they keep breaking my seizure detector app with firmware updates, which is what annoys me!