diff --git a/browser/src/components/device-modal/serial-port.tsx b/browser/src/components/device-modal/serial-port.tsx
index b03247b..cf012ef 100644
--- a/browser/src/components/device-modal/serial-port.tsx
+++ b/browser/src/components/device-modal/serial-port.tsx
@@ -29,7 +29,9 @@ export const SerialPort = ({ setErrMsg, onDisconnect }: SerialPortProps) => {
     setErrMsg('');
 
     try {
-      const port = await navigator.serial.requestPort();
+      const port = await navigator.serial.requestPort({
+        filters: [{ usbVendorId: 0x1a86, usbProductId: 0x7523 }] // CH340
+      });
       await device.serialPort.init({ port, onDisconnect });
 
       setSerialState('connected');
diff --git a/browser/src/components/menu/serial-port/index.tsx b/browser/src/components/menu/serial-port/index.tsx
index 425e688..2df7b0a 100644
--- a/browser/src/components/menu/serial-port/index.tsx
+++ b/browser/src/components/menu/serial-port/index.tsx
@@ -11,7 +11,9 @@ export const SerialPort = () => {
     setIsLoading(true);
 
     try {
-      const port = await navigator.serial.requestPort();
+      const port = await navigator.serial.requestPort({
+        filters: [{ usbVendorId: 0x1a86, usbProductId: 0x7523 }] // CH340
+      });
       await device.serialPort.init({ port });
     } finally {
       setIsLoading(false);