diff --git a/app/src/main/java/com/mylloon/mobidl/Credentials.kt b/app/src/main/java/com/mylloon/mobidl/Credentials.kt
index c0002be..eb7169a 100644
--- a/app/src/main/java/com/mylloon/mobidl/Credentials.kt
+++ b/app/src/main/java/com/mylloon/mobidl/Credentials.kt
@@ -1,13 +1,10 @@
 package com.mylloon.mobidl
 
 import android.content.Context.MODE_PRIVATE
-import android.os.Build
 import android.security.keystore.KeyProperties
 import javax.crypto.Cipher
 import android.security.keystore.KeyGenParameterSpec
-import androidx.annotation.RequiresApi
 import java.security.*
-import java.util.*
 
 
 class Credentials {
@@ -17,7 +14,6 @@ class Credentials {
     private val transformation = "RSA/ECB/PKCS1Padding" // 'type' of the key
     private val sharedPref = "com.mylloon.MobiDL" // shared pref name
 
-    @RequiresApi(Build.VERSION_CODES.M)
     fun generateKey() { // generate RSA Keys
         val keyPairGenerator = KeyPairGenerator.getInstance(
             KeyProperties.KEY_ALGORITHM_RSA, provider
@@ -96,6 +92,5 @@ class Credentials {
             }
             decrypt(array)
         } else null
-
     }
 }
diff --git a/app/src/main/java/com/mylloon/mobidl/MainActivity.kt b/app/src/main/java/com/mylloon/mobidl/MainActivity.kt
index 6631ac8..5fe484f 100644
--- a/app/src/main/java/com/mylloon/mobidl/MainActivity.kt
+++ b/app/src/main/java/com/mylloon/mobidl/MainActivity.kt
@@ -4,7 +4,6 @@ package com.mylloon.mobidl
 import android.Manifest
 import android.content.Context
 import android.content.pm.PackageManager
-import android.os.Build
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.widget.Button
@@ -15,7 +14,6 @@ import android.text.TextWatcher
 import android.view.MenuItem
 import android.view.Menu
 import android.widget.Toast
-import androidx.annotation.RequiresApi
 import androidx.core.content.ContextCompat
 import android.content.SharedPreferences
 
@@ -23,7 +21,7 @@ import android.content.SharedPreferences
 class MainActivity : AppCompatActivity() {
     private var settingsButton: Menu? = null // before starting the app there is no settings button
     private var inSettings: Boolean = false // by default your not in settings page
-    var prefs: SharedPreferences? = null // first run detection
+    private var prefs: SharedPreferences? = null // first run detection
 
     init {
         instance = this
@@ -42,7 +40,6 @@ class MainActivity : AppCompatActivity() {
         settingsButton?.findItem(R.id.settingsButton)?.isVisible = !visibility
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override fun onCreate(savedInstanceState: Bundle?) { // Main function
         super.onCreate(savedInstanceState)
         prefs = getSharedPreferences("com.mylloon.MobiDL", MODE_PRIVATE)
@@ -100,7 +97,6 @@ class MainActivity : AppCompatActivity() {
         // callScript(user, password) // call script
     }
 
-    @RequiresApi(Build.VERSION_CODES.M)
     override fun onResume() {
         super.onResume()
         if (prefs!!.getBoolean("firstrun", true)) {