Im trying to remove tunes off my maptuner that I will probably never use. I have my rxpx and my svho on my maptuner. When Im in the software I can go under the svho and it lets me uncheck the tunes and when I Synchronize it will remove the tune from the maptuner. When I select my rxpx the options are greyed out and it wont let me uncheck the tunes that I want to remove. How do I fix this?