diff --git a/android/build.gradle b/android/build.gradle
index 1ce7f8b..650dc01 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -27,6 +27,8 @@ apply plugin: 'kotlin-android'
 android {
     compileSdkVersion 31
 
+    namespace 'com.sersoluciones.flutter_pos_printer_platform' // Replace with the actual package name from AndroidManifest.xml
+
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
diff --git a/android/src/main/kotlin/com/sersoluciones/flutter_pos_printer_platform/FlutterPosPrinterPlatformPlugin.kt b/android/src/main/kotlin/com/sersoluciones/flutter_pos_printer_platform/FlutterPosPrinterPlatformPlugin.kt
index 6ff110b..e54b74a 100644
--- a/android/src/main/kotlin/com/sersoluciones/flutter_pos_printer_platform/FlutterPosPrinterPlatformPlugin.kt
+++ b/android/src/main/kotlin/com/sersoluciones/flutter_pos_printer_platform/FlutterPosPrinterPlatformPlugin.kt
@@ -200,7 +200,10 @@ class FlutterPosPrinterPlatformPlugin : FlutterPlugin, MethodCallHandler, Plugin
         adapter = USBPrinterService.getInstance(usbHandler)
         adapter.init(context)
 
+        // Initialize bluetoothService early, to avoid UninitializedPropertyAccessException
         bluetoothService = BluetoothService.getInstance(bluetoothHandler)
+        bluetoothService.setHandler(bluetoothHandler)
+        bluetoothService.setActivity(currentActivity) // In case the activity is already available
     }
 
     override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) {
@@ -269,7 +272,9 @@ class FlutterPosPrinterPlatformPlugin : FlutterPlugin, MethodCallHandler, Plugin
                 }
             }
             call.method.equals("getList") -> {
-                bluetoothService.cleanHandlerBtBle()
+                if(this::bluetoothService.isInitialized){
+                    bluetoothService.cleanHandlerBtBle()
+                }
                 getUSBDeviceList(result)
             }
             call.method.equals("connectPrinter") -> {
@@ -362,10 +367,12 @@ class FlutterPosPrinterPlatformPlugin : FlutterPlugin, MethodCallHandler, Plugin
     }
 
     private fun printBytes(bytes: ArrayList<Int>?, result: Result) {
-        if (bytes == null) return
-        adapter.setHandler(usbHandler)
-        adapter.printBytes(bytes)
-        result.success(true)
+        if (bytes == null){
+            result.success(false)
+        } else{
+            adapter.setHandler(usbHandler)
+            result.success(adapter.printBytes(bytes))
+        }
     }
 
     private fun checkPermissions(): Boolean {
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index 9854278..79641d3 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -6,7 +6,7 @@ description: Demonstrates how to use the flutter_pos_printer_platform plugin.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
 environment:
-  sdk: '>=2.18.4 <3.3.10'
+  sdk: '>=3.1.0 <4.0.0'
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions