I know that. But the crux of the matter is that the PWM stabilizer, which in turn is programmed by 16f1704, controls the voltage and current protection. It is necessary to understand how this microcontroller works together with the PWM stabilizer and change its program.
Pic microcontroller aren't very complicated most pic chips can be unlocked if you have the right equipment which I do but at the moment I don't want to rip one off a board just to dump the code. As far as the PWM many of its routines off the fan rpm.
I don't fully get that part and Efudd has a better chance of getting past it right now then anyone else out there at the moment.
One workaround could be to use a fan simulator telling the unit the fan rpm is over 5880 and this will allow for the unit to say ok we can give it some more power so at this point we need to figure out the code sent to the pic saying give more juice. Sometimes the fix could be a simple hardware mod by adding a resistor allowing a little more juice to get to the chip.
Fan simulator solution gives nothing. I am using now fan simulator because I have no fans - I am cooling the asics by liquid. The speed of fan is 30600rpm. But as the frequency rises, the voltage on the chips does not change (for 3-4 batch) or changes from 0.8 to 0.85v when the frequency changes from 500 to 750 MHz(for 102 batch). If I set the frequency higher than 750, the voltage remains constant at 0.85V and the hashrate does not change, but even drops.