Let me know how it goes. I'm afraid to turn mine off. I was re-running the update. The percentage went fine. It then re-booted to a black screen. I'll give it another 10mins before I attempt a hard reset.
I can access the system update just fine. I scroll though the user agreement, accept and then begin the actual install. The installation hits 47/48% the system reboots to a black screen. At least I still have access to safe mode. So, if Sony does release a fix, there is hope.