I purchased a used Roamio and two 9300 minis all on TE4. I downgraded the Roamio to TE3 and am now working on the minis. The screen pops up telling me I need to downgrade the minis, and I click select, which brings up the Confirm Downgrade pop-up asking for Thumbs Down x3 plus Enter to proceed. That's where I'm missing something simple because neither mini registers when I click thumbs down so I can't start the downgrade. Any ideas? Thanks.