I know this is an old thread but I just wanted to report that the process in the youtube video still works in May 22. I had my two HR24 replaced by the protection plan with C61 minis. They are in the same room so it worked great. I used a RC66RX white remote with the slider. Make sure when you do this process to turn the receiver on with the RC66RX and do not touch the RC73 remote at all during the process. Each C61 now has a different IR code and I can use the slider to quickly switch between each mini independently.I have been having a useful conversation with Stuart Sweet on Disqus.com. Stuart has created a YouTube video on how to configure the C61K for an alternate IR Code set:.
Unfortunately, even when following his instructions, I cannot get it to work using a RC65R remote. And this is the only older remote I have right now.