I am also getting this issue; sometimes my roku forces the update on power-up (no choice to skip).
After the attempt fails, the screen background comes up with no content (channel icons and widgets are missing).
However, once this happens, it seems that I can turn my TV off and on and when the roku boots again, another update notification box appears but it offers a skip option and I can get to normal operation.
Roku support: Please post a sticky comment on this thread when the issue is solved.
My device: Model 3930CA
Current vesion: 14.5.
I followed the instructions posted by waylonjames:
Disconnect router
On the remote, push the home button 5 times
Push the fast forward button 3 times
Push the rewind button 2 times
A screen should pop up giving you several options. I chose "soft reset". Then I reconnected my router. The update was successful.
