The only one on bitmain homepage:
Antminer-Z9-Mini-NAND-500M-201808311812.tar.gz
I tried both, keep settings and also unchecked it.
Did it several times and tried every combination.
the only tiny success:
installing batch 2 firmware --> change to turbo --> keep settings ---> install original firmware
Result: 550 frequency + working temperature sensor + working fan
sadly this trick does not work with batch 1 firmware and (e.g.) 650 frequency.
Keeping setting and reverting to batch 3 firmware resets the frequency to 500.
I expect batch3 firmware may be restricted to specific frequencies like the Z9 was (guessing, not verified).. If so, then it makes sense that it would reset back to 500Mhz.
Jason
But if you install batch 2 firmware where you can change to 550, can you not use the trick with inspection in web browser and up the frequence to 650 and NOT change to another firmware ?
Newest firmware does not mean best firmware always!
OR could it work to install May 26 -> set 650 -> keep setting -> install batch 2 firmware ? ? ?