I have a BDP-S3500 that I can't get to update, it fails via Wi-Fi & USB.
Upon starting the update procedure, the unit shuts off and doesn't start to update untill the power button is pressed to turn it on. Then it starts and fails. It has been restored to factory settings twice, with the same results.
It has been useless until today when I noticed an update notification option that I turned off.
So now it is usable without prompting for an update before doing anything, I'd still like to update the firmware.