TLDR;
Mine on BTC Guild and manually set the difficulty to 2048 until the new firmware is released.
+1
Confirmed.
Thank you!
Until Bitmain gets their sh*t together and upload a proper working firmware update......

use the method above. Manually set your difficulty for whatever pool you are using to 2048. You will notice a difference.
Tried applying this update. It failed, saying:
System Upgrade Failed
cp: omitting directory 'SD'
Use the above method temporarily. I am disappoint too. But we won't likely see any resolution until after their Chinese holiday.
Looks like they failed to pack the firmware TAR file properly.
My power went down for 2 seconds, and my S4 units rebooted claiming they were giving 2TH/s each.... whereas the pool reported around 100
GH/s, and also paid for that much.... for FIVE HOURS!
Setting my difficulty manually as suggested, resolved that in about 2minutes.
Not very impressed.
Bitmain better hurry up with that firmware.
