diff --git a/common/modules/mixly-modules/web/usb-mini.js b/common/modules/mixly-modules/web/usb-mini.js
index ef3ee28e..2a922740 100644
--- a/common/modules/mixly-modules/web/usb-mini.js
+++ b/common/modules/mixly-modules/web/usb-mini.js
@@ -116,7 +116,8 @@ class USBMini extends Serial {
     #defaultConfiguration_ = 1;
     #endpointIn_ = null;
     #endpointOut_ = null;
-    #interfaceNumber_ = 0;
+    #ctrlInterfaceNumber_ = -1;
+    #dataInterfaceNumber_ = -1;
     #dataLength_ = 64;
     constructor(port) {
         super(port);
@@ -149,7 +150,7 @@ class USBMini extends Serial {
                 recipient: 'interface',
                 request: 0x01,
                 value: 0x100,
-                index: this.#interfaceNumber_
+                index: this.#dataInterfaceNumber_
             }, 64);
         }
         return result?.data;
@@ -164,7 +165,7 @@ class USBMini extends Serial {
                 recipient: 'interface',
                 request: 0x09,
                 value: 0x200,
-                index: this.#interfaceNumber_
+                index: this.#dataInterfaceNumber_
             }, data);
         }
     }
@@ -203,7 +204,7 @@ class USBMini extends Serial {
         if (!selectedInterface) {
             selectedInterface = interfaces[0];
         }
-        this.#interfaceNumber_ = selectedInterface.interfaceNumber;
+        this.#dataInterfaceNumber_ = selectedInterface.interfaceNumber;
         const { endpoints } = selectedInterface.alternates[0];
         for (const endpoint of endpoints) {
             if (endpoint.direction === 'in') {
@@ -212,8 +213,13 @@ class USBMini extends Serial {
                 this.#endpointOut_ = endpoint.endpointNumber;
             }
         }
-        await this.#device_.claimInterface(0);
-        await this.#device_.claimInterface(this.#interfaceNumber_);
+        try {
+            await this.#device_.claimInterface(0);
+            this.#ctrlInterfaceNumber_ = 0;
+        } catch (_) {
+            this.#ctrlInterfaceNumber_ = -1;
+        }
+        await this.#device_.claimInterface(this.#dataInterfaceNumber_);
         super.open(baud);
         await this.setBaudRate(baud);
         this.onOpen();
@@ -238,28 +244,30 @@ class USBMini extends Serial {
         if (!this.isOpened() || this.getRawBaudRate() === baud) {
             return;
         }
-        const dwDTERate = new Uint8Array([
-            baud & 0xFF,
-            (baud >> 8) & 0xFF,
-            (baud >> 16) & 0xFF,
-            (baud >> 24) & 0xFF
-        ]);
-        const bCharFormat = 0x00;
-        const bParityType = 0x00;
-        const bDataBits = 0x08;
-        const lineCoding = new Uint8Array([
-            ...dwDTERate,
-            bCharFormat,
-            bParityType,
-            bDataBits
-        ]);
-        await this.#device_.controlTransferOut({
-            requestType: 'class',
-            recipient: 'interface',
-            request: 0x20,
-            value: 0x0000,
-            index: 0
-        }, lineCoding);
+        if (this.#ctrlInterfaceNumber_ !== -1) {
+            const dwDTERate = new Uint8Array([
+                baud & 0xFF,
+                (baud >> 8) & 0xFF,
+                (baud >> 16) & 0xFF,
+                (baud >> 24) & 0xFF
+            ]);
+            const bCharFormat = 0x00;
+            const bParityType = 0x00;
+            const bDataBits = 0x08;
+            const lineCoding = new Uint8Array([
+                ...dwDTERate,
+                bCharFormat,
+                bParityType,
+                bDataBits
+            ]);
+            await this.#device_.controlTransferOut({
+                requestType: 'class',
+                recipient: 'interface',
+                request: 0x20,
+                value: 0x0000,
+                index: this.#ctrlInterfaceNumber_
+            }, lineCoding);
+        }
         await super.setBaudRate(baud);
     }