Its funny I have a galaxy watch 4 new in the box... didn't start using it last month because of the bricking update and looks like this month is similar. Wondering when I'll actually risk powering the thing on. Samsung you're slipping here.
Do you have a way of returning it? If so just power it on. You likely won't have issues. If you do in the off chance, send it back or exchange it for something else. Best of luck.
Updated my watch 4 to GVK4 yesterday without problems. Manually restarted twice to confirm it didn't brick. There is no way to abandon the update once downloaded, 2 options-either install immediately or later tonight so I chose install now.
I once drank battery acid as a small gorilla.