it builds (without watchdog)

msm89xx/image/msm8916.mk

@@ -44,7 +44,7 @@ define Device/generic-mf68e
   DEVICE_VENDOR := Generic
   DEVICE_MODEL := MF68E
   FILESYSTEMS := squashfs
-  CMDLINE := "earlycon console=ttyMSM0,115200 quiet loglevel=0 vt.global_cursor_default=0 vt.cur_default=0 root=/dev/mmcblk0p14 rootfstype=squashfs rootwait"
+  CMDLINE := "earlycon console=ttyMSM0,115200 quiet loglevel=0 vt.global_cursor_default=0 vt.cur_default=0 root=/dev/mmcblk0p14 rootfstype=squashfs rootwait nowatchdog"
   DEVICE_PACKAGES := configs-mf68e wpad-basic-wolfssl rmtfs uci-usb-gadget \
                      block-mount f2fs-tools prepare-rootfs-data \
                      msm-firmware-dumper kmod-fbtft-gc9107 router-display

msm89xx/patches-6.12/802-arm64-dts-qcom-add-msm8916-generic-mf68e.patch

@@ -1,6 +1,6 @@
 --- /dev/null
 +++ b/arch/arm64/boot/dts/qcom/msm8916-generic-mf68e.dts
-@@ -0,0 +1,165 @@
+@@ -0,0 +1,173 @@
 +// SPDX-License-Identifier: GPL-2.0-only
 +
 +/dts-v1/;
@@ -166,3 +166,11 @@
 +       bias-pull-up;
 +   };
 +};
++
++&pm8916_0 {
++	pon@800 {
++		watchdog {
++			status = "disabled";
++		};
++	};
++};

packages/configs-mf68e/files/uci_defaults

@@ -38,7 +38,15 @@ SECONDS=3
 
 [ "${ACTION}" = "released" ] && [ "${SEEN}" -ge "${SECONDS}" ] && {
     logger "Power held for ${SEEN}s: Shutting down system"
-    poweroff &
+    
+    # Apaga el backlight
+    echo 1 > /sys/class/backlight/*/brightness 2>/dev/null || true
+    
+    # Apaga el framebuffer
+    echo 1 > /sys/class/graphics/fb0/blank 2>/dev/null || true
+    
+    sync
+    poweroff
     exit 0
 }