diff --git a/app/src/main/java/com/example/hpostesting/presentation/dashboard/HomeFragment.kt b/app/src/main/java/com/example/hpostesting/presentation/dashboard/HomeFragment.kt
index cc32501..fb1906a 100644
--- a/app/src/main/java/com/example/hpostesting/presentation/dashboard/HomeFragment.kt
+++ b/app/src/main/java/com/example/hpostesting/presentation/dashboard/HomeFragment.kt
@@ -267,13 +267,16 @@ class HomeFragment : Fragment() {
         var password = sharedPreference.getString(Constants.DEVICE_PASSWORD_API, "").toString()
         var userID = sharedPreference.getString(Constants.DEVICE_ID_API, "").toString()
         deviceId = sharedPreference.getString(Constants.DEVICE_ID, "").toString()
-
-        if (!isTokenAvailable) {
-            if(userID.isNotEmpty() || password.isNotEmpty()) {
-                if(isTokenExpired(accessToken)) {
-                    hemoCubeViewModel.login(createLoginRequestData(userID, password))
-                }
-            }
+        if(userID.isNotEmpty() && password.isNotEmpty()) {
+               if (!isTokenAvailable) {
+                   if(isTokenExpired(accessToken)) {
+                       hemoCubeViewModel.login(createLoginRequestData(userID, password))
+                    }
+                }else{
+                   isTokenAvailable = true
+                   hemoCubeViewModel.startPeriodicCheckUpdate()
+                   hemoCubeViewModel.checkUpdate(createCheckUpdateRequestData())
+             }
         } else if (userID.isEmpty() && password.isEmpty() && deviceId.isNotEmpty()) {
             fetchDeviceCredentials()
         } else {
@@ -288,9 +291,8 @@ class HomeFragment : Fragment() {
             when (response) {
                 is Result.Success -> {
                     updateTokens(response)
+                    response.data.data?.accessToken
                     isTokenAvailable = true
-                    hemoCubeViewModel.startPeriodicCheckUpdate()
-                    hemoCubeViewModel.checkUpdate(createCheckUpdateRequestData())
                 }
 
                 is Result.Error -> {
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 ca5edf2..aff99fc 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) {
@@ -82,6 +85,7 @@ open class HemocubeActivity : AppCompatActivity() {
         super.attachBaseContext(newBase)
     }
 
+    @RequiresApi(Build.VERSION_CODES.O)
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityHemocubeBinding.inflate(layoutInflater)
@@ -106,6 +110,7 @@ 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)