To clarifiy, this is the sprx that I'm talking about: http://www.nextgenupdate.com/forums/black-ops-2-gsc-mods-scripts/816460-black-ops-2-sprx-injector-32-mod-menus-v3-1-2017-fixed-edition.html
Followed all the steps in the tutorial only for nothing to happen when I spam R2.
I'm on CEX 4.82.2...