As I mentioned earlier this week, I was having trouble installing watchOS 10.3 on my Apple Watch Ultra 2.
If you’re having trouble try one of the following steps (as recommended by AWT readers Damon L. Foshee and Paul Rolfes):
° Quit the Watch app on your iPhone. Power down your Apple Watch and iPhone. Power up the iPhone and Watch, in that order, then toggle the auto update option on the iPhone’s Watch app.
° Make sure you have enough storage space;
° Try a different Wi-Fi sources.
° Try a different Apple Watch charger or charging cable.
If none of this works, you should probably take your Apple Watch to the nearest retail store (assuming there’s one near you).