Yeah there are quite a few people that have issue with flashing, because there are different version for different batch of S7. So people recommend not to flash it. But did you try a factory reset, with the on board reset button?
Yeah I tried a factory reset (and again just before I replied just in case!!!) and no luck. The annoying thing is that I have 2 antminers that I got at the same time (Batch 1) and updated with the same firmware but one works the other doesn't....
Thanks for the advice though, I think I am going to try running both off 1 controller for now
two on one controller may no longer work as you guessed it the newer firmware breaks that.
It makes for a comedy except you the op are not laughing Antminer firmware upgrades are really bad very few did anything worth while.
S-5 fan speed control was a good one. Thats about it.
good luck with 2 off one controller.