The correct setup code is 0877. When you enter it, I suspect that you won't get 2 blinks, which implies that the setup code assignment didn't work. Probably your remote has setup code lock enabled for Cable.
To disable the setup code lock,
1) Press Setup until 2 blinks
2) Enter 982

If you get 4 blinks, now your remote should accept 0877, If you get 2 blinks, do steps 1 and 2 again. 4 blinks means the lock is disabled, 2 blinks means it is enabled.

In general, when assigning setup codes, pay attention to the LEDs after you enter the setup code. If you don't see 2 blinks, the assignment wasn't accepted.

9XX Command Instructions