diff --git a/dist/index.cjs.js b/dist/index.cjs.js
index 6e5e0fa..cd9bdb1 100644
--- a/dist/index.cjs.js
+++ b/dist/index.cjs.js
@@ -198,13 +198,10 @@ class Updater {
         // check for error
         // write file length
         return new Promise(async (resolve, reject) => {
-            const buffer = new ArrayBuffer(4);
-            let view = new Int32Array(buffer);
-            view[0] = this._fileSize;
-            await this.bleObject.withPromises.write(this.bleDeviceId, this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID, buffer);
             // start notify
             this.bleObject.startNotification(this.bleDeviceId, this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID, async (rawData) => {
-                let dataView = new Int8Array(rawData);
+                let dataView = new Uint8Array(rawData);
+                console.log(dataView);
                 if (dataView[0] == 1) {
                     // send file
                     await this.sendNextPacket();
@@ -235,6 +232,10 @@ class Updater {
                     progressCallback(`Error on remote`);
                     reject("Error on remote");
                 }
+                else if (dataView[0] == 0) {
+                    // ignore no command
+                    progressCallback(`Board is on`);
+                }
                 else {
                     // no command
                     progressCallback(`Error on remote`);
@@ -244,6 +245,10 @@ class Updater {
                 reject("Error: Failed to start notify");
                 console.error(error);
             });
+            const buffer = new ArrayBuffer(4);
+            let view = new Int32Array(buffer);
+            view[0] = this._fileSize;
+            await this.bleObject.withPromises.write(this.bleDeviceId, this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID, buffer);
         });
     }
 }
diff --git a/dist/index.es.js b/dist/index.es.js
index 12793bb..f04eb23 100644
--- a/dist/index.es.js
+++ b/dist/index.es.js
@@ -196,13 +196,10 @@ class Updater {
         // check for error
         // write file length
         return new Promise(async (resolve, reject) => {
-            const buffer = new ArrayBuffer(4);
-            let view = new Int32Array(buffer);
-            view[0] = this._fileSize;
-            await this.bleObject.withPromises.write(this.bleDeviceId, this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID, buffer);
             // start notify
             this.bleObject.startNotification(this.bleDeviceId, this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID, async (rawData) => {
-                let dataView = new Int8Array(rawData);
+                let dataView = new Uint8Array(rawData);
+                console.log(dataView);
                 if (dataView[0] == 1) {
                     // send file
                     await this.sendNextPacket();
@@ -233,6 +230,10 @@ class Updater {
                     progressCallback(`Error on remote`);
                     reject("Error on remote");
                 }
+                else if (dataView[0] == 0) {
+                    // ignore no command
+                    progressCallback(`Board is on`);
+                }
                 else {
                     // no command
                     progressCallback(`Error on remote`);
@@ -242,6 +243,10 @@ class Updater {
                 reject("Error: Failed to start notify");
                 console.error(error);
             });
+            const buffer = new ArrayBuffer(4);
+            let view = new Int32Array(buffer);
+            view[0] = this._fileSize;
+            await this.bleObject.withPromises.write(this.bleDeviceId, this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID, buffer);
         });
     }
 }
diff --git a/package.json b/package.json
index d61a7e5..5fc93c2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "updaterweblibrary",
-  "version": "1.0.15",
+  "version": "1.0.16",
   "description": "OTA Updater App frontend library",
   "repository": {
     "type": "git",