I'm pretty sure that you can set it back to TV, using the Mode Map feature, but I don't have a 8910 to try it on.

If you don't mind losing any existing programming, you can do a full factory reset. See post #7 in this old thread.

If that doesn't work for you, post at www.hifi-remote.com/forums/viewforum.php.   People who still own 8910s frequent that site.