I have a camera phone, so I recorded the flashing red light as proof that it was flashing red. At least one Tech support person didn’t believe me. “ It’s not supposed to flash red.” I tried charging it to full, 100% and that did not make it change. I let the battery run down to about 80%. That did not fix it. Then I charged it back to 100%. That Did not fix it. I have three Roku ultras. I connected it to my bench, spare ultra and white the remote and wiped the spare ultra. Then I went back to my new Roku ultra from May 15, And once paired, it still flashed red.
I have no answers for you except contact Tech Support and ask for a replacement RCB1r.
I received a replacement RCB1r. It is only flashed red twice, and only for a short period of time. Although it’s the new ultra has a screen window that says pair the remote because of voice command issues (I’m paraphrasing) It was six times a show with the old remote, but maybe once or twice a day with a new remote.
As many times as I paired the old remote and wiped the old remote and wiped an ultra with the remote connected, nothing helped the old remote.
I’m still having problems with the remote that I received with the ultra on May 15. thank you for the reminder. I should get that resolved too.