Some people with this problem have reported success by using a wifi hot spot on their mobile phone as the internet connection. If/when it completes the update successfully then they could switch it back to using their home wifi network.
If you don't have a phone hot spot available you could take it to a friend or neighbor's and try using their wifi for the update.
Note: this has not been universally successful, but many people have reported it worked for them.
Roku Community Streaming Expert
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