diff --git a/doc/devices/HI-K0402WS.md b/doc/devices/HI-K0402WS.md
new file mode 100644
index 0000000..15b62a0
--- /dev/null
+++ b/doc/devices/HI-K0402WS.md
@@ -0,0 +1,62 @@
+# Hisource Hi-K0402WS
+
+Following is documentation for unmanaged switch marked as `Hi-K0402WS`.
+
+Original software is running UART on 9600 baud rate. 
+
+Using SPI clamp in-board is the only method for initial installation.
+
+The board has two flash chips `BY25Q16BS` with 16M-bit size. The front switch, switches between the two flash chips.
+These can be programed independently by using said switch - so it is e.g. possible to run the original and new firmware in parallel.
+
+### Label specifications
+
+- **Name**: 2.5G Ethernet Switch  
+- **Model**: Hi-K0402WS  
+- **Ports**:  
+  - 4 × RJ45: 10/100/1000/2500 Mbps  
+  - 2 × SFP: 1000 / 2500 / 10000 Mbps  
+
+### What works (expected from label + similar devices)
+
+- All four 2.5GBASE-T RJ45 ports at 10/100/1000/2500 Mbps  
+- Both SFP ports supporting 1G, 2.5G and 10G modules 
+- LEDs
+
+### PCB overview
+
+**Board markings**  
+- Top silkscreen: PCB-KO4022W-V3.0 / DIP-KO4022WS-V3.0  
+
+Top side
+
+<img src="photos/K0402W-V3.0-unmanaged\PCB-top.jpg" width="300" />
+
+Bottom
+
+<img src="photos/K0402W-V3.0-unmanaged\PCB-bottom.jpg" width="300" />
+
+### T2, serial console
+
+| `J2` pin | Signal      |
+| -------- | ----------- |
+| 1        | 3V3         |
+| 2        | RX (Input) |
+| 3        | TX (Output)  |
+| 4        | GND         |
+
+
+## Power supply
+
+Input power is delivered via barell plug, `12V 1A` adapter was provided.
+Board has two supply rails. `0.95` and `3.3` volt.
+
+### `0.95` Core Voltage
+
+Voltage is made by a `Techcode TD1720` .
+
+### `3.3` Voltage
+
+Voltage is created by chip marked as `Techcode TD1720`.
+
+**There seems to have been a miscalculation when choosing the inductor and the device is ~25% more efficient with an 5V power supply.**
diff --git a/machine.c b/machine.c
index f2b29de..44868cb 100644
--- a/machine.c
+++ b/machine.c
@@ -2,6 +2,7 @@
 #include "rtl837x_pins.h"
 #include "rtl837x_leds.h"
 #include "rtl837x_regs.h"
+#include "rtl837x_common.h"
 
 #ifdef MACHINE_KP_9000_6XHML_X2
 __code const struct machine machine = {
@@ -265,4 +266,53 @@ __code const struct machine machine = {
 
 void machine_custom_init(void) { }
 
-#endif
+#elif defined MACHINE_HI_K0402WS
+__code const struct machine machine = {
+	.machine_name = "HiSource HI-K0402WS",
+	.isRTL8373 = 0,
+	.min_port = 3,
+	.max_port = 8,
+	.n_sfp = 2,
+	.log_to_phys_port = {0, 0, 0, 6, 1, 2, 3, 4, 5},
+	.phys_to_log_port = {4, 5, 6, 7, 8, 3, 0, 0, 0},
+	.is_sfp = {0, 0, 0, 1, 0, 0, 0, 0, 1},
+	
+	// Left SFP port
+	.sfp_port[0].pin_detect = GPIO38, 
+	.sfp_port[0].pin_los = GPIO_NA, 
+	.sfp_port[0].sds = 1, 
+	.sfp_port[0].i2c =  { .sda = GPIO39_I2C_SDA4, .scl = GPIO40_I2C_SCL3_MDC1 }, 
+
+	// Right SFP port
+	.sfp_port[1].pin_detect = GPIO37,
+	.sfp_port[1].pin_los = GPIO_NA, 
+	.sfp_port[1].sds = 0, 
+	.sfp_port[1].i2c = { .sda = GPIO41_I2C_SDA3_MDIO1, .scl = GPIO40_I2C_SCL3_MDC1 }, 
+
+	.reset_pin = GPIO_NA,
+	.high_leds = { .mux =  LED_28 | LED_29, .enable = LED_27 | LED_28 | LED_29 },
+	.port_led_set = { 0, 0, 0, 1, 0, 0, 0, 0, 1},
+	.led_sets = { 
+			{
+				LEDS_2G5 | LEDS_LINK | LEDS_10M | LEDS_ACT,
+				LEDS_1G | LEDS_100M | LEDS_10M | LEDS_LINK | LEDS_ACT | LEDS_10G,
+				LEDS_1G | LEDS_LINK, 
+				0 
+			},
+			{  
+				LEDS_10G | LEDS_2G5 | LEDS_1G | LEDS_100M | LEDS_10M | LEDS_LINK,
+				LEDS_10G | LEDS_2G5 | LEDS_1G | LEDS_100M | LEDS_10M | LEDS_ACT,
+				0,
+				0
+			},
+	 },
+	.led_mux_custom = 1,
+	.led_mux = {
+				0x00,0x01,0x04,0x05,0x08,0x09,0x0c,0x3f,0x0d,0x10,0x11,0x0e,0x14,0x11,0x12,0x15,0x15,0x16,0x18,0x19,0x1a,0x19,0x1d,0x1e,0x1c,0x1d,0x20,0x21
+		},
+	};
+
+void machine_custom_init(void) { 
+	reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
+}
+#endif
\ No newline at end of file
diff --git a/machine.h b/machine.h
index cba1ac8..1d4cf76 100644
--- a/machine.h
+++ b/machine.h
@@ -13,6 +13,7 @@
 // #define MACHINE_HORACO_ZX_SG4T2
 // #define MACHINE_TRENDNET_TEG_S562
 // #define MACHINE_HG0402XG_V1_1
+// #define MACHINE_HI_K0402WS
 // #define DEFAULT_8C_1SFP
 
 // #define DEFAULT_5C_1SFP