So this just happened to me and I was able to fix it!
I have two Studio Displays connected to my 16" MacBook Pro (2021, M1) and saw that there was a new firmware update for my Studio Display(s). (Sry, I dont remember which one it was, but the most recent update available)
One of my displays restored with no problems, but the second one was stuck in a loop between the support/warning message and three loading dots...
I tried to run through the basic troubleshooting steps in this article -- but nothing worked.
Contacted Apple Support via chat, but unfortunately the agent wasnt much help. She tried to walk me through the same article, then went immediately to me booking a Genius Bar appointment because "it must be hardware-related." I've worked in IT for years and repaired dozens of machines/displays, so I decided to keep troubleshooting on my own.
After some research, I came across a forum that mentioned four critical things that could be stopping the update :
- You have the display connected to a computer that is not plugged into power. (Basically your display is powering the laptop) So I plugged my laptop into a power outlet.
- Ensure that FileVault is not enabled (so turn it off or use another computer)
- Ensure you dont have a hard-drive plugged into the display or machine
- If you can - try to use the thunderbolt cable that came in the box with your display
This is when I had the 'ah-ha' moment because I literally had my G-Drive backup plugged into my display. So I unplugged the display from everything, plugged it back in, and the minute I saw that "support.apple.com" screen, I plugged the thunderbolt cable back into my laptop. Waited for about 4 minutes, it switched to the 3 dots, a blank screen, then I saw my desktop picture! (There was also a pop-up on my laptop that asked if it was ok to connect to the accessory -- so I knew the display was trying to make a connection)
I truly hope this helps someone and you don't get talked into taking this huge display to a store for no reason. I knew it wasn't hardware based on my previous experiences and this display was only a week old.
Best of luck everyone!! ;)