If this is one of the new Express models that doesn't come with a power adapter make sure the one you're using can supply at least 1 Amp. Look at the fine print on the adapter and look for something like "Output: 5V 1A". Greater than 1A is even better.
If that's not it, the other common issue is the inability to do the initial update over some people's networks. If you can connect to another network like your phone's hotspot try that just to get through the initial update.
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