Help & troubleshooting for network issues, including connecting your device to your home Wi-Fi network, connecting to public networks, troubleshooting wireless issues & ethernet connections, and optimizing streaming performance.
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 Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T