I checked the IR dataset for your Sony KDF-50E2000 TV and the dot (.) command is already there. You should try it first in device mode. If it works in device mode, then proceed directly with your "Favorite Channel" setup, else teach it, then proceed with your "Favorite Channel" setup. Please let me know if you get an ASSERTION error with your 880 during the update process when using the dot (.) command in the "Favorite Channel" setup.