...snip..

I apologize for the confusion, all my tests above have been completed on a Z9 mini so absolutely no objections on the work you have done with your custom firmware, in fact, great job!!! And good luck with adding additional features you're currently working on!
Back to Z9 mini firmware from May 26,with unlocked overclocking, only the fist 3 boards are hashing, the fourth one connected to the fourth connector is not displayed in stats and not hashing, the board/heat sinks  are cold so it's not hashing at all and updating only the HTML didn't help.