diff --git a/z8102/files/etc/init.d/z8102 b/z8102/files/etc/init.d/z8102
index 36c3ffe2c..7cbd75e6d 100755
--- a/z8102/files/etc/init.d/z8102
+++ b/z8102/files/etc/init.d/z8102
@@ -1,6 +1,6 @@
 #!/bin/sh /etc/rc.common
 # Copyright (C) 2013 OpenWrt.org
-# Copyright (C) 2023 Yannick Chabanois (Ycarus) for OpenMPTCProuter
+# Copyright (C) 2023-2025 Yannick Chabanois (Ycarus) for OpenMPTCProuter
 
 START=00
 USE_PROCD=1
@@ -48,7 +48,22 @@ modem1()
 	else
 		gpioset -t0 modem1=1
 	fi
+	if [ -n "$(uci -q get network.modem1)" ] && [ -z "$(uci -q get network.modem1.device)" ]; then
+		sleep 20
+		if [ -e /sys/devices/platform/soc/11200000.usb/usb1/1-1/1-1.1 ]; then
+			uci -q batch <<-EOF
+				set network.modem1.device='/sys/devices/platform/soc/11200000.usb/usb1/1-1/1-1.1'
+				commit network
+			EOF
+		elif [ -e /sys/devices/platform/soc/11200000.usb/usb2/2-1/2-1.1 ]; then
+			uci -q batch <<-EOF
+				set network.modem1.device='/sys/devices/platform/soc/11200000.usb/usb2/2-1/2-1.1'
+				commit network
+			EOF
+		fi
+	fi
 }
+
 modem2()
 {
 	# sim 2
@@ -88,7 +103,22 @@ modem2()
 	else
 		gpioset -t0 modem2=1
 	fi
+	if [ -n "$(uci -q get network.modem2)" ] && [ -z "$(uci -q get network.modem2.device)" ]; then
+		sleep 20
+		if [ -e /sys/devices/platform/soc/11200000.usb/usb1/1-1/1-1.2 ]; then
+			uci -q batch <<-EOF
+				set network.modem2.device='/sys/devices/platform/soc/11200000.usb/usb1/1-1/1-1.2'
+				commit network
+			EOF
+		elif [ -e /sys/devices/platform/soc/11200000.usb/usb2/2-1/2-1.2 ]; then
+			uci -q batch <<-EOF
+				set network.modem2.device='/sys/devices/platform/soc/11200000.usb/usb2/2-1/2-1.2'
+				commit network
+			EOF
+		fi
+	fi
 }
+
 start_service()
 {
 	modem="$1"