OP says....
So if I'm reading this right, with the ignition OFF, once the pressure is released at the bleed nipples, wheels rotate freely, still with the ignition off, you pump the pedal and still all is o.k, wheels move?
Next step, ignition on, engine off....... ,wheels move? ABS fault
Next step, ignition on, engine on......wheels move? ABS or Servo fault.
I know it's frustrating, but I don't think you have done any serious damage, just think the system needs pressure bleeding. As a long shot you could try pulling the ABS fuse or disconnecting the feed to the ABS pump and see if that works?