They deleted sections of the routing. That means that the only recovery point which is within the mainframe is inaccessible without completely overclocking the motherboard and frying most if not all components. They’re using industrial strength fans right now to try to cool the servers enough for another attempt at bypassing the route modules and going straight to the physical bus lines on the nodes in question. This is painstaking work and will take hours if not days, and there’s no guarantee they can do it without causing so much surface damage that the data is corrupted and irretrievable.