Fx35 key fob programming

My wifes key fob quit on her a few weeks ago. I let her use mine since and it works fine. I replaced the battery in hers and it still would not work, so I thought it lost its programming. I used the procedure for nissans and everything went as prescibed, but when I pushed the lock button the hazzards did not flash but I heard a beep from the car. Key fob does not work still. Any ideas? Also the magic number for key insertions seems to be 8.

Must be the battery is completely gone faulty. try to replace it i am sure it should work fine.