Originally posted by jedt
You lost me there.
Yeah my intention was to borrow the game, use the code download the ps4 version and return the PS3 version - why can that not be done?
Yeah that was confusing looking back at it.
I'm not sure if you need to put the disc in the PS3, or straight into the PS4 first but after downloading the PS4 upgrade the PS4 looks for the PS3 Ghosts disc to be in the PS4 drive anytime you play it. I was told after asking and researching that there's no redeemable code; the upgrade is tied to the disc.
All PS3 to PS4 upgrades do the same thing. I got Ghosts digital so the process is different and I can't test your method. Game sharing on 3 gives you freedom since there isn't a disc. It's to prevent the loss of money.