So non of these suggestions worked for me. Decided to open her up and take a peek. Didn't see anything wrong. The sync button would make noise but wouldn't blink. My remotes were stuck in a infinite slow blinking stage. Never connecting. Got tired of wired remote use when I opened it open disconnected Power-sync-eject ribbon. Looked fine. Everything looked fine. Still didn't work. Then I disconnected reconnected black skinny cable going from wifi card on top of metal casing on back left corner. Finally got my remote to connect ?. Nothing else worked but this. Hopefully this helps anybody. Last entry I seen was 2018 on this page and couldn't find anything else online other than hard resets, and part replacements. I guess I got lucky.