diff --git a/target/linux/ramips/dts/mt7628an_hongdian_h7920-v40.dts b/target/linux/ramips/dts/mt7628an_hongdian_h7920-v40.dts
new file mode 100644
index 0000000000..76c395c382
--- /dev/null
+++ b/target/linux/ramips/dts/mt7628an_hongdian_h7920-v40.dts
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7628an.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "hongdian,h7920-v40", "mediatek,mt7628an-soc";
+	model = "Hongdian H7920 v40";
+
+	aliases {
+		led-boot = &led_sys;
+		led-failsafe = &led_sys;
+		led-running = &led_sys;
+		led-upgrade = &led_sys;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-rf {
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = "rf";
+		};
+
+		led-net {
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_MOBILE;
+		};
+
+		led_sys: led-sys {
+			gpios = <&gpio 37 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_POWER;
+			default-state = "on";
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	watchdog {
+		compatible = "linux,wdt-gpio";
+
+		gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
+		hw_algo = "toggle";
+		hw_margin_ms = <600>;
+		always-running;
+	};
+
+	gpio-export {
+		compatible = "gpio-export";
+
+		gpio_modem_power {
+			gpio-export,name = "modem_power";
+			gpio-export,output = <0>;
+			gpios = <&gpio 4 GPIO_ACTIVE_HIGH>;
+		};
+
+		gpio_serial_rs485_mode {
+			gpio-export,name = "serial_rs485_mode";
+			gpio-export,output = <0>;
+			gpios = <&gpio 6 GPIO_ACTIVE_HIGH>;
+		};
+	};
+};
+
+&watchdog {
+	status = "disabled";
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <40000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x30000>;
+				read-only;
+			};
+
+			partition@30000 {
+				label = "u-boot-env";
+				reg = <0x30000 0x10000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "factory";
+				reg = <0x40000 0x10000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					eeprom_factory_0: eeprom@0 {
+						reg = <0x0 0x400>;
+					};
+
+					macaddr_factory_28: macaddr@28 {
+						reg = <0x28 0x6>;
+					};
+				};
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x50000 0xfb0000>;
+			};
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "i2s", "gpio", "refclk";
+		function = "gpio";
+	};
+};
+
+&ethernet {
+	nvmem-cells = <&macaddr_factory_28>;
+	nvmem-cell-names = "mac-address";
+};
+
+&esw {
+	mediatek,portmap = <0x3e>;
+	mediatek,portdisable = <0x3c>;
+};
+
+&wmac {
+	status = "okay";
+
+	nvmem-cells = <&eeprom_factory_0>;
+	nvmem-cell-names = "eeprom";
+};
+
+&uart1 {
+	status = "okay";
+};
+
+&pcie {
+	status = "okay";
+};
diff --git a/target/linux/ramips/image/mt76x8.mk b/target/linux/ramips/image/mt76x8.mk
index c7168cc936..314f8e1e9f 100644
--- a/target/linux/ramips/image/mt76x8.mk
+++ b/target/linux/ramips/image/mt76x8.mk
@@ -321,6 +321,15 @@ define Device/hiwifi_hc5861b
 endef
 TARGET_DEVICES += hiwifi_hc5861b
 
+define Device/hongdian_h7920-v40
+  IMAGE_SIZE := 16064k
+  DEVICE_VENDOR := Hongdian
+  DEVICE_MODEL := H7920
+  DEVICE_VARIANT := v40
+  DEVICE_PACKAGES := kmod-usb2 kmod-usb-ohci kmod-usb-net-qmi-wwan kmod-usb-serial-option uqmi
+endef
+TARGET_DEVICES += hongdian_h7920-v40
+
 define Device/iptime_a3
   IMAGE_SIZE := 7936k
   UIMAGE_NAME := a3
diff --git a/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network b/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
index 23ec31f912..372821c3b8 100644
--- a/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
@@ -107,7 +107,8 @@ ramips_setup_interfaces()
 			"2:lan:2" "3:lan:1" "4:wan" "6@eth0"
 		;;
 	duzun,dm06|\
-	glinet,gl-mt300n-v2)
+	glinet,gl-mt300n-v2|\
+	hongdian,h7920-v40)
 		ucidef_add_switch "switch0" \
 			"1:lan" "0:wan" "6@eth0"
 		;;
@@ -277,6 +278,7 @@ ramips_setup_macs()
 	totolink,a3)
 		wan_mac=$(mtd_get_mac_binary u-boot 0x1fc40)
 		;;
+	hongdian,h7920-v40|\
 	jotale,js76x8-8m|\
 	jotale,js76x8-16m|\
 	jotale,js76x8-32m|\
diff --git a/target/linux/ramips/mt76x8/base-files/etc/board.d/03_gpio_switches b/target/linux/ramips/mt76x8/base-files/etc/board.d/03_gpio_switches
new file mode 100644
index 0000000000..c70e59c480
--- /dev/null
+++ b/target/linux/ramips/mt76x8/base-files/etc/board.d/03_gpio_switches
@@ -0,0 +1,20 @@
+#
+# Copyright (C) 2025 OpenWrt.org
+#
+
+. /lib/functions/uci-defaults.sh
+
+board_config_update
+
+board=$(board_name)
+
+case "$board" in
+hongdian,h7920-v40)
+	ucidef_add_gpio_switch "modem_enable" "Modem power" "modem_power" "1"
+	ucidef_add_gpio_switch "switch_serial_mode" "Switch RS232 to RS485" "serial_rs485_mode" "0"
+	;;
+esac
+
+board_config_flush
+
+exit 0