I've never had this happen with any of mine (at least not so far, knock wood...) but it is frequently reported.
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.
This has not been universally successful, but many people have reported it worked for them.
Let us know how you make out.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
