diff --git a/common/modules/mixly-modules/web/burn-upload.js b/common/modules/mixly-modules/web/burn-upload.js
index cb3bc32c..14e027ef 100644
--- a/common/modules/mixly-modules/web/burn-upload.js
+++ b/common/modules/mixly-modules/web/burn-upload.js
@@ -657,11 +657,9 @@ BU.uploadWithAmpy = (portName) => {
     const mainWorkspace = Workspace.getMain();
     const editor = mainWorkspace.getEditorsManager().getActive();
     let useBuffer = true, dataLength = 256;
-    if (BOARD?.web?.devices?.usb) {
-        useBuffer = true;
+    if (Serial.type === 'usb') {
         dataLength = 64;
-    } else if (BOARD?.web?.devices?.hid) {
-        useBuffer = true;
+    } else if (Serial.type === 'hid') {
         dataLength = 31;
     }
     layer.open({
diff --git a/common/modules/mixly-modules/web/serial.js b/common/modules/mixly-modules/web/serial.js
index f6dded09..e1d880e2 100644
--- a/common/modules/mixly-modules/web/serial.js
+++ b/common/modules/mixly-modules/web/serial.js
@@ -58,6 +58,8 @@ if (platform === 'win32' && fullPlatform !== 'win10') {
 
 class WebSerial extends Device {
     static {
+        this.type = Device.type;
+
         this.getConfig = function () {
             return Device.getConfig();
         }