URC7935: When I try to set up an Apple TV, the Menu Ring blinks red 4 times after a few seconds and after that the remote does not control the Apple TV?

There is only one code for the Apple TV, so it could be missed in the SimpleSet procedure.
  1. Try again by holding the STREAMER POWER and HOME keys until the red LED blink twice.
  2. Release them and hold down the TV POWER key until you see one red blink. 
  3. Release the TV Power key and the Menu Ring will blink green twice and the remote should now operate your Apple TV.

See also:

Universal Remotes: Which code can I use to operate my Apple TV 4?