now that you are back at 1.9, you can finally do what I wanted you to do few days ago:
try to install 1.9 again, by those "special methods"
at first, try to install it with link button, without debug file
if it doesn't help, try the opposite - without link button, but with debug file
if still nothing, try only firmware 1.9 bin file, no link button, no debug file (this is really last chance - in one of your
previous log file there is one moment when most of the modules were detected, maybe some miracle happens again)
if all of this fails, then, I'm afraid, AC is bricked for good
you can always try to load this 1.9 repeatedly and maybe once again modules will be detected