It just times out after a while/
Same from different browsers and different devices.
2nd die on first chip has not worked at any point; totally screwed I think.
Have you tried a ribbon cable from a working cube on that one?
YMMV
The other three dies on that cube work for the most part so I think cable issues are unlikely to be the cause; I have tried swapping that cube with another one i.e. different PCI-e cable, different PSU, different ribbon, different beagle socket/
I managed to get the firmware uploaded; must have tried 8 or 9 times that timed out and then it worked for no apparent reason. Now I have no advanced tab and additional errors:
1.1.x is ASIC 2 die 2, increase the V on that die. As Tiggger said that's an indication that the die/VRMs have turned off.
If you can't bring up the advanced tab try clearing browser cache. Also Elenelen reports it can take some time to load so give it a few minutes. Worst case, use putty to login and edit the VRM config file manually then reboot.