I have a few S17+ 73Th units. I am able to find and display the menu, make the edits for the voltage and freq to appear. However upon save they never stick. Any ideas?

Antminer S17+
Hostname   antMiner
Model   GNU/Linux
Hardware Version   35.0.1.3
Kernel Version   Linux 4.6.0-xilinx-gff8137b-dirty #25 SMP PREEMPT Fri Nov 23 15:30:52 CST 2018
File System Version   Tue Apr 7 14:11:08 CST 2020
CGminer Version   1.0.0