Hey Miners - Decided to upgrade my S5s (I have 12 of them now) to the new firmware off the antminer site (https://bitmaintech.com/support.htm?pid=00720150101032800325X8cMcY2y068F) of 2015-07-15. It adds some fan control updates (like being able to override to custom fan speeds) and fixed some of the overload protection issues that occurred before. I noticed though that on about half my miners, it caused issues.

On 7 of them, the update went smoothly. The firmware installed, the fan controls were there and the miner roared back to full speed. On the others, the same issue seemed to occur on all, in that they were suddenly mining at about half speed (400-500GH/s for the most part), yet all the hash boards seemed fine. Additionally, the alarm for temp was freaking out constantly, yet all the miners were in the 50C to 65C range. I ended up rolling these back to the 20150415 firmware and they are back to normal.

Anyone else have these issues with the upgrade?

Denis