So...
You're saying whatever is causing the particle a light year away to spin down cannot be used to convey information. That is the confusing part of this.
If you can do something to that particle here (spin it up) and it is does something to that entangled particle there (spins it down), what is causing that to happen? And why can't whatever that is be used to send or receive information back and forth? Already SOME kind of information (the spinning up and spinning down) is passing from one particle to the other over that vast distance in real time. If some other type of information could be stored on the particle couldn't it share it with the distant entangled particle?