My roku will not recognize my wireless extender. I tried restarting the roku and my modem and no luck. It refuses to see the extension. The previous suggestions did not resolve this problem.
Does your extender operate in the 2.4 GHz wifi band?
If not, is your Roku an Express or Premiere? These are budget models that have single band wifi radios that only support the 2.4 GHz band, but not the 5 GHz band.