using this : antminer-z9-mini-201805262047-500m.tar.gz my miners are OC-able and have no problem with temp readings, just FYI
are you saying you used the mini firmware on the non-mini and it worked?
It will not work properly. It will only initialize 4 of the 16 ASICs.
Otherwise, yes, the mini firmware will work on the Z9, just not to potential.
-j