switched over the Braiins-OS and is now getting better hashrate than this one without devfee.

also found that this firmware has mis-reported temperature value and it doesn't support ASICBOOST.

TEMP2 shows only 85 C whereas Braiins shows 102C, and when you lay you hands on the exhaust fan side, you can notice the temp difference is higher on the 85C miner, which means it is a lie.

S9i overclocked to 750M at 9.1V and is running stable for a couple hours now. Has rate is now around 16T, temp is 105 Max.

Yep the Russian firmware is awesome, it seems to work just out of box really, I wonder how long it took them to test it, but how do you know it is 7％? How to find out about this I am curious? If we know the hidden pool it uses, perhaps we can block it by firewall?

how do you know it's 7%? any way to check this? 1.5~7% is a huge difference.

This firmware is by far the best and foolproof firmware I've used on S9i ( I cannot speak for other models).

Both of my S9i with 1600W bitmain stock PSU can go up to 16TH stable with temp around 90C, ambient temp around 20C.

Pump from 14T to 16T and taking 1.8% with the watchdog functionality I'd say it's a pretty good deal, it's like hiring a bot to watch over your mining rigs, not at all a bad investment. Personally I have yet to figure out how it does this though as pool doesn't report anything unusual.

Of course the HIDDEN FEE and closed source is not a way to do this, but I guess this is just one of the lesser evils.

As for the Rocketship mod, I'd appreciate the guy's effort to do it but at 16T it isn't very stable and temp is up to <110 degree, which is a bit scary...

Anyway, thanks OP for sharing, I'd like to share my 2 cents hope it helps others.