New to modding & trying to follow youtube video on BO1 need help

trying to help my husband who is new to all this modding and what not, anyway he found a you tube video by kshadow22 showing how to do USB mod on BO1 for COD. and I am not getting it on once you are suppose to open some file found on here. any help would be greatly appreciated. thank you

Can you post a link to the file on here you’re talking about?