I have a Motorola DCX3501M box from Charter Cable. But, the set up algorithm did not list this box. The closest box it listed was a DCX3400M. Why isn't my box listed?
Because there are probably well over 50,000 different devices out there and realistically Sling cannot possibly have built-in remotes for all of them.
I assume you have already done a proper Forum Search for your model number in case other people have already answered your question ?
If so and that didn't help then check out this thread: https://community.sling.com/thread/3300?tstart=0
Come back if it that doesn't help either.
(NOT a Sling Media representative, just another user)
I have the same set top box from Charter. The supplied remote is the UR4U-MDVR-CHD2. As you know, it is not a listed set top box or remote. I have posted an "Idea" to Sling to add this remote. Please go to the Forums and search for my post using the search tag "UR4U-MDVR-CHD2" or Motorola DCX 3510-M and vote for this Request.
In the mean time, I use the DCX3400M suggested remote It works fine. Althought the buttons are not in the exact same location as on our UR4U-MDVR-CHD2, they work fine and I have been able to get along doning this.
Remember, if you want Sling to add the remote, go to the Forums, Search for our remote and VOTE! (;-)