Hi There. I also had some issues updating firmware when I first got it. You’re right, WiFi firmware updates were added later.
I ended up having to use a different USB stick. No matter how I formatted it the first stick I used never worked - it’s a bit finicky I guess?
You’re not missing a 2nd USB port.
Here’s another topic about this: Discussion of Snapmaker 2.0 Firmware Updates.
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