@jor2404 for the NesPi4Case :
1/ Connect the Pi4 to the case and activate the safeshutdown button. Use the case manual to install it correctly.
2/ Install recalbox 8.0.2 if not done lol
3/ Connect your Recalbox to the internet. Connect in SSH. Authorize partition boot writting with this command : mount -o remount,rw /boot.
In the boot part look for the recalbox-boot.conf file. Open it.
Look for the case=none:1 line. Change it by case=NESPi4:1.
Save the changes.
4/ Still in the boot part look for the recalbox-user-config.txt file. At the end of the file, add this line : dtoverlay=gpio-poweroff,gpiopin=4,active_low=1,input=1
Save the changes.
5/ Reboot, your NesPi4Case is totally operationnal 🙂