I'm not sure which function you mean by "Enter".  I think the Sharp has a Select function and a Return function.  The EFC for Select is 11444 and Return 12476

Try this in AUX mode:
1) Press Setup until 2 blinks
2) Enter 994 (2 blinks)
3) Tap Setup  (don't hold it)
4) Enter 11444
5) Press OK/Select (or any other button, except devices and Setup.

Now pressing OK/Select should send the Blu-ray Select function.
If the needed function is Return, use 12476 instead.  It's OK to use HD Zoom/Enter if you like.