Is .mnu file cached somewhere?

Long Vu 17/01/2017
I have created a .mnu file for unattended Centos 7 Installation using a Kickstart file.
I have modified the "title" inside the .mnu file but in the boot menu, it is still the same.
I also tried the delete that .mnu file from my usb key and the boot menu still list it !
So is that .mnu files cached somewhere? What to do to be absolutely sure the latest .mnu files is being used?

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