Moved home and have new temporary broadband.
I have a flashing white light and I know that my ROKU is not communicating with the WIFI and I need to update it.
However using the remote doesn’t work and I can’t get to the ROKU screen to update it so caught in a catch 22.
Make sure your TV is set on the correct HDMI port the Roku is feeding into.
Source ....Input.... use yur TV's remote.
Then you need to pair your remote.
You should be seeing something purple on your screen.
PoP the batterys out of the Roku and back in ....
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Worked perfectly, thanks so much.