Pressing 5 to change codes on 2000 series panels only works when the Change Passcode prompt in the Passcode part of programming is set to Owner & User. Selecting Owner will prevent Users from changing codes by pressing 5. (Selecting Disabled prevents code changes by anyone)
To change codes as an Owner, press 6 followed by an Owners code. Select 0 to change codes and then a code to change (1-8). Enter the code and then enter again to complete the change. Next to verify the code is of the correct type press Clear and then 6, wait and let the screen scroll thru the code types. Should the code type be incorrect, follow the prompts to modify code types.