So i sent a email bitmain asking a question and they replied
And please kindly upgrade the firmware of S4+ and S5 with below link:
S5 firmware:
https://www.bitmaintech.com/files/tmp/SD-S5-20150711.tar.gz
S4+ firmware:
https://www.bitmaintech.com/files/tmp/SD-S4+-20150711.tar.gz
Best Regards
BITMAIN
Anyone knows what's new on this firmware?
You might email them and ask. I know the big thing some experienced loss of internet and then the miner would get really hot. It seems to be hit or miss.
I have not experienced it, but some have. I would guess this is biggest thing they had to work on to fix what ever caused some machines and not others to do this. If they put it in this ... only know by asking
It is weird but that firmware is not in the normal area. When they release it and put it there it shows changes. So maybe soon they add it to there.