No idea. My OTA (AM21N on HR34) and previous recordings worked on my C31 but were a bit problematic. Periodic freeze problems requiring a channel change or exit to come out of it. Sometimes audio dropped out - returned by pausing/unpausing. Two sat recordings, Dexter and Homeland, didn't record of course. Don't know if they would have eventually been rescheduled. I added another showing explicitly so as not to miss them. As a retired software engineer... I would expect this to have been a standard test case all along and a mature product like this should have automatically recovered 100%. The crap they consider good enough these days is just shocking.