New answers tagged device-tree
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I have had both of these work to force pin 17 low after shutdown. Not sure if this will work for your situation or with any other pins.
option 1.
edit /boot/config.txt
add this
dtoverlay=gpio-poweroff,gpiopin=17,active_low=1
option 2
run this from command line
sudo dtoverlay -v gpio-poweroff gpiopin=17 active_low=1
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