diff --git a/target/linux/mediatek/dts/mt7981b-zbtlink-zbt-z8106ax-s.dts b/target/linux/mediatek/dts/mt7981b-zbtlink-zbt-z8106ax-s.dts
new file mode 100644
index 0000000000..3c5d1bfa1f
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7981b-zbtlink-zbt-z8106ax-s.dts
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+
+#include "mt7981b-zbtlink-zbt-z8106ax.dtsi"
+
+/ {
+	model = "Zbtlink ZBT-Z8106AX-S";
+	compatible = "zbtlink,zbt-z8106ax-s", "mediatek,mt7981b";
+};
+
+&port_4 {
+	/* The 4th port must be defined but isn't usable in model S, so we set it to disabled. */
+	status = "disabled";
+};
+
diff --git a/target/linux/mediatek/dts/mt7981b-zbtlink-zbt-z8106ax.dtsi b/target/linux/mediatek/dts/mt7981b-zbtlink-zbt-z8106ax.dtsi
index 07e49b1013..8a4d06d53b 100644
--- a/target/linux/mediatek/dts/mt7981b-zbtlink-zbt-z8106ax.dtsi
+++ b/target/linux/mediatek/dts/mt7981b-zbtlink-zbt-z8106ax.dtsi
@@ -189,7 +189,7 @@
 			label = "lan4";
 		};
 
-		port@4 {
+		port_4: port@4 {
 			reg = <4>;
 			label = "wwan";
 		};
diff --git a/target/linux/mediatek/filogic/base-files/etc/board.d/01_leds b/target/linux/mediatek/filogic/base-files/etc/board.d/01_leds
index 97684d232b..82df17d87f 100644
--- a/target/linux/mediatek/filogic/base-files/etc/board.d/01_leds
+++ b/target/linux/mediatek/filogic/base-files/etc/board.d/01_leds
@@ -330,6 +330,7 @@ zbtlink,zbt-z8103ax|\
 zbtlink,zbt-z8103ax-c)
 	ucidef_set_led_netdev "wan" "wan" "green:wan" "eth1" "link tx rx"
 	;;
+zbtlink,zbt-z8106ax-s|\
 zbtlink,zbt-z8106ax-t)
 	ucidef_set_led_netdev "wan" "wan" "amber:wan" "eth1" "link tx rx"
 	ucidef_set_led_netdev "mobile" "mobile" "green:mobile" "wwan" "link tx rx"
diff --git a/target/linux/mediatek/filogic/base-files/etc/board.d/02_network b/target/linux/mediatek/filogic/base-files/etc/board.d/02_network
index 9fa03a8edc..2a47c12063 100644
--- a/target/linux/mediatek/filogic/base-files/etc/board.d/02_network
+++ b/target/linux/mediatek/filogic/base-files/etc/board.d/02_network
@@ -76,7 +76,8 @@ mediatek_setup_interfaces()
 	unielec,u7981-01*|\
 	wavlink,wl-wn536ax6-a|\
 	zbtlink,zbt-z8102ax|\
-	zbtlink,zbt-z8102ax-v2)
+	zbtlink,zbt-z8102ax-v2|\
+	zbtlink,zbt-z8106ax-s)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4" "eth1"
 		;;
 	zbtlink,zbt-z8106ax-t)
diff --git a/target/linux/mediatek/filogic/base-files/etc/board.d/03_gpio_switches b/target/linux/mediatek/filogic/base-files/etc/board.d/03_gpio_switches
index 336f5ba60d..0820bd97c8 100644
--- a/target/linux/mediatek/filogic/base-files/etc/board.d/03_gpio_switches
+++ b/target/linux/mediatek/filogic/base-files/etc/board.d/03_gpio_switches
@@ -21,6 +21,7 @@ zbtlink,zbt-z8102ax-v2)
 	ucidef_add_gpio_switch "sim1" "SIM 1" "sim1" "1"
 	ucidef_add_gpio_switch "sim2" "SIM 2" "sim2" "1"
 	;;
+zbtlink,zbt-z8106ax-s|\
 zbtlink,zbt-z8106ax-t)
 	ucidef_add_gpio_switch "4g" "Power modem" "4g" "1"
 	ucidef_add_gpio_switch "sim" "SIM" "sim" "1"
diff --git a/target/linux/mediatek/image/filogic.mk b/target/linux/mediatek/image/filogic.mk
index c75301c111..0112da0484 100644
--- a/target/linux/mediatek/image/filogic.mk
+++ b/target/linux/mediatek/image/filogic.mk
@@ -3449,6 +3449,24 @@ define Device/zbtlink_zbt-z8103ax-c
 endef
 TARGET_DEVICES += zbtlink_zbt-z8103ax-c
 
+define Device/zbtlink_zbt-z8106ax-s
+  DEVICE_VENDOR := Zbtlink
+  DEVICE_MODEL := ZBT-Z8106AX-S
+  SUPPORTED_DEVICES += zbtlink,z8106ax-2sim
+  DEVICE_DTS := mt7981b-zbtlink-zbt-z8106ax-s
+  DEVICE_DTS_DIR := ../dts
+  DEVICE_PACKAGES := kmod-mt7915e kmod-mt7981-firmware mt7981-wo-firmware kmod-usb3 kmod-usb-net-qmi-wwan kmod-usb-serial-option
+  KERNEL_IN_UBI := 1
+  UBINIZE_OPTS := -E 5
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  IMAGE_SIZE := 65536k
+  IMAGES += factory.bin
+  IMAGE/factory.bin := append-ubi | check-size $$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+endef
+TARGET_DEVICES += zbtlink_zbt-z8106ax-s
+
 define Device/zbtlink_zbt-z8106ax-t
   DEVICE_VENDOR := Zbtlink
   DEVICE_MODEL := ZBT-Z8106AX-T