You will have to make a decision, do you want the OFA remote to control your receiver, or the oem remote. You can't have both, sorry. Your receiver is using a new code set AV2, the factory default. You can change the receiver to the old code set AV1, but not your oem remote. Maybe the best thing for you to do, is leave it in AV2 mode, and get a true learning remote. But if you want to change, so the OFA's remote codes will work, heres how;

On the front of the receiver, push the SETUP button.
Press the left or right directional button until the display on the front of the receiver reads C.MODE AV2. Using the jog dialTM control, press the plus(+) or minus(-) button until C.MODEchanges in the display.