OKAY, so I have the real solution to this. Don’t waste your time on random Youtube videos, and guessing the code, you will mess things up……Here is the easiest way to get this done:
Step 1: Find your VIN number.
Step 2: Go to https://radiocodevault.com/acura/ and follow their instructions, they lay everything out crystal clear.
Step 3: After you submit your information to them, they’ll email you back your unique unlock code pretty quick.
Enter the code, and you now have a working stereo again.
Good luck! Best method I could find. And some others here have mentioned it, it seems.