If you are experiencing a PlayStation 4 error code E-8210604a, there are a few things that you can do in order to fix the issue. First, make sure that your console is up and running properly by checking its status. If everything is normal, then it may be worth trying to reset the console by going to the PlayStation 4 settings and selecting “reset.” If resetting does not work, then you may need to take your console to a service center in order to have it fixed. If all of these steps still do not help, then you may need to take your PlayStation 4 into an authorized Sony store in order to have it fixed.