The bad news is that none of the current remotes work with the model 3500 remote. I'm uncertain of the details on that -- @Tivoburkee and others may be able to offer more information -- but one the 3500 remote goes bad, you're out of luck, to my understanding.
I will mention that all of the current Roku devices vastly out-perform the older sticks, including the 3500 and 3600 models, should you decide to replace the device with an upgraded Roku.
DBDukes Roku Community Streaming Expert Note: I am not a Roku employee.
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