well, people were doing upgrades because their gear was working, but close to 100C, at least i was on one machine and only because someone posted that upgrading decrease chip temp a bit. I did not upgrade two other S9 because the upgrade procedure was so bizarre. Who knows how long miner can tolerate being close or at 100C. I have a feeling that during summer/fall one of S9 boards faulted because of the high temp, but I could be wrong.