thank you so much, that did it

I searched specifically the error message, didn't think too much about the case

@sylasebas

here are some more of the messages before the trying events ...

umount: can't umount /recalbox/share/bootvideos: Transport endpoint is not connected
umount: can't umount /recalbox/share/system/.config/retroarch/assets: Transport endpoint is not connected
umount: tmpfs busy - remounted read-only
umount: can't remount tmpfs read-only
umount: /dev/mmcblk0p1 busy - remounted read-only
umount: none busy - remounted read-only
umount: sysfs busy - remounted read-only
Trying /dev/input/event0
Trying /dev/input/event1
Trying /dev/input/event2
Trying /dev/input/event3
Trying /dev/input/event4
Trying /dev/input/event5
Trying /dev/input/event6
Trying /dev/input/event7
Not found.
Retrying in 30s.

Hello guys

I was wondering if you might be able to help me. I'm using a Raspberry Pi 4 together with a RetroFlag Nespi 4 case. In order to use the power button the case, I changed the recalbox.conf according to this post and remove the ; from line 14

# System Variable
# You can configure your recalbox from here
# To set a variable, remove the first ; on the line
 
# ------------ A - System Options ----------- #
#    Uncomment the system.power.switch you use
;system.power.switch=ATX_RASPI_R2_6      # http://lowpowerlab.com/atxraspi/#installation
;system.power.switch=MAUSBERRY           # http://mausberry-circuits.myshopify.com/pages/setup
;system.power.switch=REMOTEPIBOARD_2003  # http://www.msldigital.com/pages/support-for-remotepi-board-2013
;system.power.switch=REMOTEPIBOARD_2005  # http://www.msldigital.com/pages/support-for-remotepi-board-plus-2015
;system.power.switch=WITTYPI             # http://www.uugear.com/witty-pi-realtime-clock-power-management-for-raspberry-pi
;system.power.switch=PIN56ONOFF          # https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)
;system.power.switch=PIN56PUSH           # https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)
;system.power.switch=PIN356ONOFFRESET    # https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)
;system.power.switch=PIN356PUSHRESET     # https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)

it seems to work as it starts to shut down, the LED is blinking but it doesn't power off.
The same happened before using the power button by just shutting Recalbox down via UI.

in the console, it shows the following message over and over again:

Trying /dev/input/event0
Trying /dev/input/event1
Trying /dev/input/event2
Trying /dev/input/event3
Trying /dev/input/event4
Trying /dev/input/event5
Trying /dev/input/event6
Trying /dev/input/event7
Not found.
Retrying in 30s.

does anyone have any idea on how to solve this issue?

Thanks so much and best regards, Sylas