Hi there @seongyoonchoi , and Welcome to the community
I have merged your new topic post to this thread, where we discuss everything about the New Firmware Update v3.0.0 issue.
Things you can try before attempting to update:
- EMO must be on his charger
- Smart lights are unplugged
- Automatic update is turned off in the app.
- Try updating by voice command, “Install latest firmware now”.
All the best