diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0c762aa01..bcdc7579a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ jobs:
   build:
     strategy:
       matrix:
-        OMR_TARGET: [bpi-r1, bpi-r2, bpi-r3, bpi-r4, bpi-r4-poe, bpi-r64, rpi2, rpi4, wrt32x, espressobin, r2s, rpi3, wrt3200acm, x86, x86_64, ubnt-erx, r4s, r7800, rutx12, rutx50, r5s, qnap-301w, rpi5, z8102ax_128m, z8102ax_64m, gl-mt6000, r5c]
+        OMR_TARGET: [bpi-r1, bpi-r2, bpi-r3, bpi-r4, bpi-r4-poe, bpi-r64, rpi2, rpi4, wrt32x, espressobin, r2s, rpi3, wrt3200acm, x86, x86_64, ubnt-erx, r4s, r7800, rutx12, rutx50, r5s, qnap-301w, rpi5, z8102ax_128m, z8102ax_64m, gl-mt6000, r5c, z8109ax_128m]
         OMR_KERNEL: [6.6, 6.12]
     runs-on: ubuntu-latest
     continue-on-error: true
diff --git a/z8102/files/etc/init.d/z8102 b/z8102/files/etc/init.d/z8102
index f7afb900f..8a2ca4113 100755
--- a/z8102/files/etc/init.d/z8102
+++ b/z8102/files/etc/init.d/z8102
@@ -9,85 +9,35 @@ log() {
 	logger -t "z8102" "$@"
 }
 
-modem1()
+modem_reset()
 {
-	# sim 1
-	#i=461
-	#echo $i > /sys/class/gpio/export
-	#echo "out" > /sys/class/gpio/gpio${i}/direction
-	#echo "0" > /sys/class/gpio/gpio${i}/value
-	if [ -e /sys/class/gpio/sim1/value ]; then
-		echo "0" > /sys/class/gpio/sim1/value
+	modemnb=$1
+	# sim
+	if [ -e /sys/class/gpio/sim${modemnb}/value ]; then
+		echo "0" > /sys/class/gpio/sim${modemnb}/value
 	elif [ -f /usr/bin/gpiofind ]; then
-		gpioset `gpiofind "sim1"`=0
+		gpioset `gpiofind "sim=${modemnb}"`=0
 	else
-		gpioset -t0 sim1=0
+		gpioset -t0 sim${modemnb}=0
 	fi
 
-	# stop modem 1
-	#i=459
-	#echo $i > /sys/class/gpio/export
-	#echo "out" > /sys/class/gpio/gpio${i}/direction
-	#echo "0" > /sys/class/gpio/gpio${i}/value
-	if [ -e /sys/class/gpio/modem1/value ]; then
-		echo "0" > /sys/class/gpio/modem1/value
+	# stop modem
+	if [ -e /sys/class/gpio/modem${modemnb}/value ]; then
+		echo "0" > /sys/class/gpio/modem${modemnb}/value
 	elif [ -f /usr/bin/gpiofind ]; then
-		gpioset `gpiofind "modem1"`=0
+		gpioset `gpiofind "modem${modemnb}"`=0
 	else
-		gpioset -t0 modem1=0
+		gpioset -t0 modem${modemnb}=0
 	fi
 
 	sleep 1
-	# run modem 1
-	#i=459
-	#echo "1" > /sys/class/gpio/gpio${i}/value
-	if [ -e /sys/class/gpio/modem1/value ]; then
-		echo "1" > /sys/class/gpio/modem1/value
+	# run modem
+	if [ -e /sys/class/gpio/modem${modemnb}/value ]; then
+		echo "1" > /sys/class/gpio/modem${modemnb}/value
 	elif [ -f /usr/bin/gpiofind ]; then
-		gpioset `gpiofind "modem1"`=1
+		gpioset `gpiofind "modem${modemnb}"`=1
 	else
-		gpioset -t0 modem1=1
-	fi
-}
-
-modem2()
-{
-	# sim 2
-	#i=462
-	#echo $i > /sys/class/gpio/export
-	#echo "out" > /sys/class/gpio/gpio${i}/direction
-	#echo "0" > /sys/class/gpio/gpio${i}/value
-	if [ -e /sys/class/gpio/sim2/value ]; then
-		echo "0" > /sys/class/gpio/sim2/value
-	elif [ -f /usr/bin/gpiofind ]; then
-		gpioset `gpiofind "sim2"`=0
-	else
-		gpioset -t0 sim2=0
-	fi
-
-	# stop modem 2
-	#i=460
-	#echo $i > /sys/class/gpio/export
-	#echo "out" > /sys/class/gpio/gpio${i}/direction
-	#echo "0" > /sys/class/gpio/gpio${i}/value
-	if [ -e /sys/class/gpio/modem2/value ]; then
-		echo "0" > /sys/class/gpio/modem2/value
-	elif [ -f /usr/bin/gpiofind ]; then
-		gpioset `gpiofind "modem2"`=0
-	else
-		gpioset -t0 modem2=0
-	fi
-
-	sleep 1
-	# run modem 2
-	#i=460
-	#echo "1" > /sys/class/gpio/gpio${i}/value
-	if [ -e /sys/class/gpio/modem2/value ]; then
-		echo "1" > /sys/class/gpio/modem2/value
-	elif [ -f /usr/bin/gpiofind ]; then
-		gpioset `gpiofind "modem2"`=1
-	else
-		gpioset -t0 modem2=1
+		gpioset -t0 modem${modemnb}=1
 	fi
 }
 
@@ -96,18 +46,28 @@ start_service()
 	modem="$1"
 	if [ -z "$modem" ]; then
 		log "Enable SIMs and reboot modems..."
-		modem1
-		modem2
+		modem_reset 1
+		modem_reset 2
+		if [ -n "$(cat /etc/board.json | grep z8109)" ]; then
+			modem_reset 3
+			modem_reset 4
+		fi
 	elif [ "$modem" = "modem1" ]; then
 		log "Enable SIM1 and reboot modem1..."
-		modem1
+		modem_reset 1
 	elif [ "$modem" = "modem2" ]; then
 		log "Enable SIM2 and reboot modem2..."
-		modem2
+		modem_reset 2
+	elif [ "$modem" = "modem3" ]; then
+		log "Enable SIM3 and reboot modem3..."
+		modem_reset 3
+	elif [ "$modem" = "modem4" ]; then
+		log "Enable SIM4 and reboot modem4..."
+		modem_reset 4
 	fi
 }
 
 restart()
 {
-	start_service "@"
-}
\ No newline at end of file
+	start_service "$@"
+}