Nope, this is misinformation.

Folks are uploading footage that shows you can get through initial setup and to the home screen just fine without the day one update.

You need the update to play switch 1 games via backward compatability, which is what most folks are trying first as they have them.
Really? Yesterday I read that the console didn't work without the day 1 update. I guessed that would mean no MK world footage because you can't play with the console yet?

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