Verified answer

Use the official guide on Comcast.com

http://www.comcast.com/remotes/?LinkID=100

Select the image of the remote you have and it'll give you all the directions you need.

Unlock CBL Remote code to allow programming:

1) Press AND HOLD SELECT and CBL until light blinks TWICE.

2) Enter 996 on keypad

3) Press CH- to unlock remote

Use table in manual or cable co provided code

AT8550 Remote Manual

»www.scientificatlanta.com/Explor···4357.pdf

ER1 Remote Manual

»www.scientificatlanta.com/Explor···6360.pdf

AT2000-4 Remote

»www.scientificatlanta.com/Explor···5117.pdf

AT2300

»www.scientificatlanta.com/Explor···5466.pdf

AT8400D

»www.scientificatlanta.com/Explor···-Web.pdf

AT8400B

»www.scientificatlanta.com/Explor···trol.pdf

AT8420

»www.scientificatlanta.com/Explor···trol.pdf

AT8450

»www.scientificatlanta.com/Explor···1707.pdf

AT2400

»www.scientificatlanta.com/Explor···9221.pdf

do you know the make and model number of the remote?

its should have an instruction Manuel