Along with all star stuff, NBA 2K14 has updated the ball texture with Adam Silver's signature. This means the game will automatically use that ball over any that you download.
I made this to get around these updates
https://www.youtube.com/watch?v=XOy6rikv4r0
but you can also use Keep My Mod, which Benji updated for 2K14 here - viewtopic.php?f=152&t=93527#p1668616
I've just noticed an increase in popularity of ball mods lately, so I wanted to get this out early.