Hi, obviously I'm not visible enough ... I offer my mod for T9+ for free available here:
https://drive.google.com/drive/folders/1yl0fym6ezHnKptGaHrWB6W2Rl2p9nwNpWARNING, this is a mod, it unlocks the firmware, for this, you must first install a firmware before 2019 (if this is not already the case), then subsequently, update via the interface of the miner with my mod (929kb archive only).
You can start tuning at 650mhz and 840mv, the miner will run cooler, less power, and around 12TH
this mod is completely free;)