diff --git a/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemocubeActivity.kt b/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemocubeActivity.kt
index cb3d223..8ebdbb0 100644
--- a/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemocubeActivity.kt
+++ b/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemocubeActivity.kt
@@ -11,12 +11,14 @@ import android.content.ServiceConnection
 import android.hardware.usb.UsbDevice
 import android.hardware.usb.UsbDeviceConnection
 import android.hardware.usb.UsbManager
+import android.os.Build
 import android.os.Bundle
 import android.os.IBinder
 import android.util.Log
 import android.view.Menu
 import android.widget.Toast
 import androidx.activity.viewModels
+import androidx.annotation.RequiresApi
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
 import androidx.core.view.get
@@ -43,6 +45,7 @@ open class HemocubeActivity : AppCompatActivity() {
     private val TAG = "HemoCube"
 
     private val broadcastReceiver = object : BroadcastReceiver() {
+        @RequiresApi(Build.VERSION_CODES.O)
         override fun onReceive(context: Context, intent: Intent) {
 
             synchronized(this) {
@@ -81,6 +84,7 @@ open class HemocubeActivity : AppCompatActivity() {
     }
 
 
+    @RequiresApi(Build.VERSION_CODES.O)
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityHemocubeBinding.inflate(layoutInflater)
@@ -105,6 +109,7 @@ open class HemocubeActivity : AppCompatActivity() {
         }
     }
 
+    @RequiresApi(Build.VERSION_CODES.O)
     open fun connectUsb(permissionGranted: Boolean) {
         Log.d(TAG, "connectUsb() called, permission variable = $permissionGranted")
         val manager = getSystemService(Context.USB_SERVICE) as UsbManager
@@ -125,32 +130,40 @@ open class HemocubeActivity : AppCompatActivity() {
     }
 
 
-    @SuppressLint("MutableImplicitPendingIntent")
+    @RequiresApi(Build.VERSION_CODES.O)
+    @SuppressLint("UnspecifiedImmutableFlag")
     private fun requestUserPermission(manager: UsbManager, device: UsbDevice) {
         val mPendingIntent: PendingIntent
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) {
-            mPendingIntent = PendingIntent.getBroadcast(
-                this, 0, Intent(Constants.HEMOCUBE_USB_PERMISSION), PendingIntent.FLAG_MUTABLE
-            )
-        } else {
-            mPendingIntent = PendingIntent.getBroadcast(
-                this,
-                0,
-                Intent(Constants.HEMOCUBE_USB_PERMISSION),
+        val pendingIntentFlags = when {
+            Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
+                PendingIntent.FLAG_IMMUTABLE
+            }
+            else -> {
                 PendingIntent.FLAG_ONE_SHOT or PendingIntent.FLAG_IMMUTABLE
-            )
+            }
         }
 
+        mPendingIntent = PendingIntent.getBroadcast(
+            this,
+            0,
+            Intent(Constants.HEMOCUBE_USB_PERMISSION),
+            pendingIntentFlags
+        )
+
         val filter = IntentFilter(Constants.HEMOCUBE_USB_PERMISSION)
-        registerReceiver(broadcastReceiver, filter)
+        registerReceiver(broadcastReceiver, filter, RECEIVER_EXPORTED)
+
+        // Request permission
         manager.requestPermission(device, mPendingIntent)
     }
 
+
     fun setupService() {
         val intent = Intent(this, UsbService::class.java)
         bindService(intent, connection, Context.BIND_AUTO_CREATE)
     }
 
+    @RequiresApi(Build.VERSION_CODES.O)
     open fun reconnectDevice() {
         mService.disconnect()
         unbindService(connection)