diff --git a/z8102/files/etc/init.d/z8102 b/z8102/files/etc/init.d/z8102
index fd2e5d75e..e9f85969c 100755
--- a/z8102/files/etc/init.d/z8102
+++ b/z8102/files/etc/init.d/z8102
@@ -9,9 +9,8 @@ log() {
 	logger -t "z8102" "$@"
 }
 
-start_service()
+modem1()
 {
-	log "Enable SIMs and reboot modems..."
 	# sim 1
 	#i=461
 	#echo $i > /sys/class/gpio/export
@@ -22,16 +21,6 @@ start_service()
 	else
 		gpioset `gpiofind "sim1"`=0
 	fi
-	# 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
-	else
-		gpioset `gpiofind "sim2"`=0
-	fi
 
 	# stop modem 1
 	#i=459
@@ -44,6 +33,29 @@ start_service()
 		gpioset `gpiofind "modem1"`=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
+	else
+		gpioset `gpiofind "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
+	else
+		gpioset `gpiofind "sim2"`=0
+	fi
+
 	# stop modem 2
 	#i=460
 	#echo $i > /sys/class/gpio/export
@@ -56,15 +68,6 @@ start_service()
 	fi
 
 	sleep 1
-	# run modem 1
-	#i=459
-	#echo "1" > /sys/class/gpio/gpio${i}/value
-	if [ -e /sys/class/gpio/modem1/value ]; then
-		echo "1" > /sys/class/gpio/modem1/value
-	else
-		gpioset `gpiofind "modem1"`=1
-	fi
-	sleep 3
 	# run modem 2
 	#i=460
 	#echo "1" > /sys/class/gpio/gpio${i}/value
@@ -74,3 +77,18 @@ start_service()
 		gpioset `gpiofind "modem2"`=1
 	fi
 }
+start_service()
+{
+	modem="$1"
+	if [ -z "$modem" ]; then
+		log "Enable SIMs and reboot modems..."
+		modem1
+		modem2
+	elif [ "$modem" = "modem1" ]; then
+		log "Enable SIM1 and reboot modem1..."
+		modem1
+	elif [ "$modem" = "modem2" ]; then
+		log "Enable SIM2 and reboot modem2..."
+		modem2
+	fi
+}
\ No newline at end of file