I've been having the same problem until today on my O S+1. Now SPI @3.3V and die1 with -0.0806V and 675MHz made it work. I was getting higher rates with 231 around 450GH/s. Now with all other dies @775MHz total close to 425GH/s with less errors.... Also with all other dies at -0.1465V, power dropped from 560W (w/ Stock values) to 460W at the wall.
Is there a way to 231 the other ASICs and leave this slepy die1 on ASIC alone @675MHz?
So you ran the whole board at 1A1 and the dead die came back to life? Did you have to roast it to 80c first?
I just tried to run the dead die at that speed and keep the rest overclocked and it didn't wake up.. maybe the whole board huh?
no magic bullet yet