Trying to install WatchOS 5.1. Just update my iPhone X to 12.1. Then went to update my SS Apple Watch 4 to watchOS 5.1. Put Watch on charger started download and install. It downloaded and started the install. Progress ring on watch started. It then went away. Now I just have the Apple Logo for the past 20 Minutes. No Progress ring.
Watch Series 4 (GPS+Cellular) (SS) 44mm, watchOS 5.1
Mine bricked after trying to install the latest update too. Took it to Apple on Wednesday. They said they had to send it out and I haven't heard a thing about it since (been 4 days so far).
Noticed the same when my wife’s replacement watch came in. Appears that the watch only does a backup when you unpair it. So when you unpaired your Watch 3 a backup was created which only includes your apps, layout, and other settings. Your Health data is backed up each time your phone backs up so this data is safe. Once the restore was complete here Watch 4 was back to normal other than losing a couple days of health data.
Found the following support posting on Apple which has the details: Back up your Apple Watch - Apple Support
WachOS 5.1 Bricked my Watch 4
