If its for a. Nissan it won't program the fob because of the nissan nats system I have tryed it with my mk808 and my ms908 without any joy

It should be program automatic once key got programmed

  I had a provided aftermarket Smart key for a 2008 Lexus ES 350 I wanted to add to the existing working OE one with my IM508. When I went to add it, I did get a little confirmation chirp that something happened, but the New aftermarket Smart key never took and wouldn't work. I tried multiple times with the IM508 without success, so  I took out the XP400 programmer and it was able to identify the OE key type as a TIRIS DST+ , but it was unable to identify the aftermarket Smart key chip in the provided aftermarket mart key, so I concluded the provided Aftermarket Smart Key was a Lemon and myself as Insane , because I even tried getting that key to take with my Maxi Sys Elite. because you just never know  if  a Bigger tool will give that little knockoff chip in the smart key a bigger B@tch slap, and she start working , LOL:-))