The Channel Lock feature routes the Ch+/-, digits, and OK keys to the cable box, even when the remote is in TV device mode. The feature can be disabled, but most people actually want the Ch+/- keys to always go to the cable box.
So instead, do a keymove-- assign a function code to a key. In UEI remotes, when a key is pressed, the remote looks to see if a keymove has been defined, then if a macro has been defined, then for Channel Lock or Volume Punch Through, and finally the basic function assigned to the key. So the keymove gets priority.
Press Setup until 2 blinks
Enter 00164 (this is the EFC for OK in 11265)
should get 2 blinks