diff --git a/mobile/src/main/AndroidManifest.xml b/mobile/src/main/AndroidManifest.xml
index 3d7e527d..96bcb999 100644
--- a/mobile/src/main/AndroidManifest.xml
+++ b/mobile/src/main/AndroidManifest.xml
@@ -69,7 +69,6 @@
         <activity
             android:name=".MainActivity"
             android:exported="true"
-            android:label="@string/app_name"
             android:launchMode="singleTask"
             android:windowSoftInputMode="stateAlwaysHidden">
             <intent-filter>
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt b/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
index 3c8d2aff..aeee8468 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
@@ -68,7 +68,8 @@ class RepeaterService : Service(), CoroutineScope, WifiP2pManager.ChannelListene
         val safeModeConfigurable get() = Build.VERSION.SDK_INT >= 29 && hasP2pValidateName
         val safeMode get() = Build.VERSION.SDK_INT >= 29 &&
                 (!hasP2pValidateName || app.pref.getBoolean(KEY_SAFE_MODE, true))
-        private val mNetworkName by lazy { UnblockCentral.WifiP2pConfig_Builder_mNetworkName }
+        @get:RequiresApi(29)
+        private val mNetworkName by lazy @TargetApi(29) { UnblockCentral.WifiP2pConfig_Builder_mNetworkName }
 
         var networkName: String?
             get() = app.pref.getString(KEY_NETWORK_NAME, null)
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/client/Client.kt b/mobile/src/main/java/be/mygod/vpnhotspot/client/Client.kt
index e035e76c..461068c6 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/client/Client.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/client/Client.kt
@@ -42,10 +42,10 @@ open class Client(val mac: MacAddressCompat, val iface: String) {
          * we hijack the get title process to check if we need to perform MacLookup,
          * as record might not be initialized in other more appropriate places
          */
-        SpannableStringBuilder(if (record.nickname.isEmpty()) {
+        SpannableStringBuilder(record.nickname.ifEmpty {
             if (record.macLookupPending) MacLookup.perform(mac)
             macIface
-        } else record.nickname).apply {
+        }).apply {
             if (record.blocked) setSpan(StrikethroughSpan(), 0, length, Spanned.SPAN_INCLUSIVE_INCLUSIVE)
         }
     }
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/manage/TetherManager.kt b/mobile/src/main/java/be/mygod/vpnhotspot/manage/TetherManager.kt
index 1a3d9a3f..0974e76e 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/manage/TetherManager.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/manage/TetherManager.kt
@@ -225,9 +225,7 @@ sealed class TetherManager(protected val parent: TetheringFragment) : Manager(),
                         yield(SoftApCapability.featureLookup(bit, true))
                         features = features and bit.inv()
                     }
-                }.joinToSpanned().let {
-                    if (it.isEmpty()) parent.getText(R.string.tethering_manage_wifi_no_features) else it
-                })
+                }.joinToSpanned().ifEmpty { parent.getText(R.string.tethering_manage_wifi_no_features) })
             if (Build.VERSION.SDK_INT >= 31) {
                 val list = SoftApConfigurationCompat.BAND_TYPES.map { band ->
                     val channels = capability.getSupportedChannelList(band)
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringFragment.kt b/mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringFragment.kt
index 060f7b77..a74f45e7 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringFragment.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringFragment.kt
@@ -182,14 +182,14 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
             R.id.configuration -> item.subMenu.run {
                 findItem(R.id.configuration_repeater).isNotGone = Services.p2p != null
                 findItem(R.id.configuration_temp_hotspot).isNotGone =
-                        adapter.localOnlyHotspotManager.binder?.configuration != null
+                        Build.VERSION.SDK_INT >= 26 && adapter.localOnlyHotspotManager.binder?.configuration != null
                 true
             }
             R.id.configuration_repeater -> {
                 adapter.repeaterManager.configure()
                 true
             }
-            R.id.configuration_temp_hotspot -> {
+            R.id.configuration_temp_hotspot -> @TargetApi(26) {
                 WifiApDialogFragment().apply {
                     arg(WifiApDialogFragment.Arg(adapter.localOnlyHotspotManager.binder?.configuration ?: return false,
                             readOnly = true))
@@ -239,7 +239,7 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
             if (which == DialogInterface.BUTTON_POSITIVE) viewLifecycleOwner.lifecycleScope.launchWhenCreated {
                 val configuration = ret!!.configuration
                 @Suppress("DEPRECATION")
-                if (Build.VERSION.SDK_INT in 28 until 30 &&
+                if (Build.VERSION.SDK_INT >= 28 && Build.VERSION.SDK_INT < 30 &&
                         configuration.isAutoShutdownEnabled != TetherTimeoutMonitor.enabled) try {
                     TetherTimeoutMonitor.setEnabled(configuration.isAutoShutdownEnabled)
                 } catch (e: Exception) {
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/TetheringManager.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/TetheringManager.kt
index 0521e7b4..11eac3d9 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/TetheringManager.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/TetheringManager.kt
@@ -189,7 +189,7 @@ object TetheringManager {
         Class.forName("android.net.ConnectivityManager\$OnStartTetheringCallback")
     }
     @get:RequiresApi(24)
-    private val startTetheringLegacy by lazy {
+    private val startTetheringLegacy by lazy @TargetApi(24) {
         ConnectivityManager::class.java.getDeclaredMethod("startTethering",
                 Int::class.java, Boolean::class.java, classOnStartTetheringCallback, Handler::class.java)
     }
@@ -206,34 +206,36 @@ object TetheringManager {
         Class.forName("android.net.TetheringManager\$TetheringRequest\$Builder")
     }
     @get:RequiresApi(30)
-    private val newTetheringRequestBuilder by lazy { classTetheringRequestBuilder.getConstructor(Int::class.java) }
+    private val newTetheringRequestBuilder by lazy @TargetApi(30) {
+        classTetheringRequestBuilder.getConstructor(Int::class.java)
+    }
 //    @get:RequiresApi(30)
 //    private val setStaticIpv4Addresses by lazy {
 //        classTetheringRequestBuilder.getDeclaredMethod("setStaticIpv4Addresses",
 //                LinkAddress::class.java, LinkAddress::class.java)
 //    }
     @get:RequiresApi(30)
-    private val setExemptFromEntitlementCheck by lazy {
+    private val setExemptFromEntitlementCheck by lazy @TargetApi(30) {
         classTetheringRequestBuilder.getDeclaredMethod("setExemptFromEntitlementCheck", Boolean::class.java)
     }
     @get:RequiresApi(30)
-    private val setShouldShowEntitlementUi by lazy {
+    private val setShouldShowEntitlementUi by lazy @TargetApi(30) {
         classTetheringRequestBuilder.getDeclaredMethod("setShouldShowEntitlementUi", Boolean::class.java)
     }
     @get:RequiresApi(30)
-    private val build by lazy { classTetheringRequestBuilder.getDeclaredMethod("build") }
+    private val build by lazy @TargetApi(30) { classTetheringRequestBuilder.getDeclaredMethod("build") }
 
     @get:RequiresApi(30)
     private val interfaceStartTetheringCallback by lazy {
         Class.forName("android.net.TetheringManager\$StartTetheringCallback")
     }
     @get:RequiresApi(30)
-    private val startTethering by lazy {
+    private val startTethering by lazy @TargetApi(30) {
         clazz.getDeclaredMethod("startTethering", Class.forName("android.net.TetheringManager\$TetheringRequest"),
                 Executor::class.java, interfaceStartTetheringCallback)
     }
     @get:RequiresApi(30)
-    private val stopTethering by lazy { clazz.getDeclaredMethod("stopTethering", Int::class.java) }
+    private val stopTethering by lazy @TargetApi(30) { clazz.getDeclaredMethod("stopTethering", Int::class.java) }
 
     @Deprecated("Legacy API")
     @RequiresApi(24)
@@ -498,11 +500,11 @@ object TetheringManager {
         Class.forName("android.net.TetheringManager\$TetheringEventCallback")
     }
     @get:RequiresApi(30)
-    private val registerTetheringEventCallback by lazy {
+    private val registerTetheringEventCallback by lazy @TargetApi(30) {
         clazz.getDeclaredMethod("registerTetheringEventCallback", Executor::class.java, interfaceTetheringEventCallback)
     }
     @get:RequiresApi(30)
-    private val unregisterTetheringEventCallback by lazy {
+    private val unregisterTetheringEventCallback by lazy @TargetApi(30) {
         clazz.getDeclaredMethod("unregisterTetheringEventCallback", interfaceTetheringEventCallback)
     }
 
@@ -621,7 +623,7 @@ object TetheringManager {
             "TETHER_ERROR_UNSUPPORTED", "TETHER_ERROR_UNAVAIL_IFACE", "TETHER_ERROR_MASTER_ERROR",
             "TETHER_ERROR_TETHER_IFACE_ERROR", "TETHER_ERROR_UNTETHER_IFACE_ERROR", "TETHER_ERROR_ENABLE_NAT_ERROR",
             "TETHER_ERROR_DISABLE_NAT_ERROR", "TETHER_ERROR_IFACE_CFG_ERROR", "TETHER_ERROR_PROVISION_FAILED",
-            "TETHER_ERROR_DHCPSERVER_ERROR", "TETHER_ERROR_ENTITLEMENT_UNKNOWN") { clazz }
+            "TETHER_ERROR_DHCPSERVER_ERROR", "TETHER_ERROR_ENTITLEMENT_UNKNOWN") @TargetApi(30) { clazz }
     @RequiresApi(30)
     const val TETHER_ERROR_NO_CHANGE_TETHERING_PERMISSION = 14
 
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/IpMonitor.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/IpMonitor.kt
index 1999ff65..151aa5b5 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/IpMonitor.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/IpMonitor.kt
@@ -114,8 +114,8 @@ abstract class IpMonitor {
                 try {
                     RootManager.use { server ->
                         // while we only need to use this server once, we need to also keep the server alive
-                        handleChannel(server.create(ProcessListener(errorMatcher, Routing.IP, "monitor", monitoredObject),
-                            this))
+                        handleChannel(server.create(ProcessListener(errorMatcher,
+                            Routing.IP, "monitor", monitoredObject), this))
                     }
                 } catch (_: CancellationException) {
                 } catch (e: Exception) {
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/TetherTimeoutMonitor.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/TetherTimeoutMonitor.kt
index abba1855..430c7bc3 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/TetherTimeoutMonitor.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/TetherTimeoutMonitor.kt
@@ -45,8 +45,9 @@ class TetherTimeoutMonitor(private val timeout: Long = 0,
                 } else {
                     val info = WifiApManager.resolvedActivity.activityInfo
                     val resources = app.packageManager.getResourcesForApplication(info.applicationInfo)
-                    resources.getInteger(resources.findIdentifier("config_wifiFrameworkSoftApShutDownTimeoutMilliseconds",
-                        "integer", WifiApManager.RESOURCES_PACKAGE, info.packageName))
+                    resources.getInteger(resources.findIdentifier(
+                        "config_wifiFrameworkSoftApShutDownTimeoutMilliseconds", "integer",
+                        WifiApManager.RESOURCES_PACKAGE, info.packageName))
                 }
             } catch (e: RuntimeException) {
                 Timber.w(e)
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/SoftApConfigurationCompat.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/SoftApConfigurationCompat.kt
index ae370769..74b17702 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/SoftApConfigurationCompat.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/SoftApConfigurationCompat.kt
@@ -94,8 +94,7 @@ data class SoftApConfigurationCompat(
         /**
          * Based on:
          * https://elixir.bootlin.com/linux/v5.12.8/source/net/wireless/util.c#L75
-         * TODO: update for Android 12
-         * https://cs.android.com/android/platform/superproject/+/master:frameworks/base/wifi/java/android/net/wifi/ScanResult.java;l=624;drc=f7ccda05642b55700d67a288462bada488fc7f5e
+         * https://cs.android.com/android/platform/superproject/+/master:packages/modules/Wifi/framework/java/android/net/wifi/ScanResult.java;l=789;drc=71d758698c45984d3f8de981bf98e56902480f16
          */
         fun channelToFrequency(band: Int, chan: Int) = when (band) {
             BAND_2GHZ -> when (chan) {
@@ -211,23 +210,23 @@ data class SoftApConfigurationCompat(
         @get:RequiresApi(30)
         private val newBuilder by lazy @TargetApi(30) { classBuilder.getConstructor(SoftApConfiguration::class.java) }
         @get:RequiresApi(30)
-        private val build by lazy { classBuilder.getDeclaredMethod("build") }
+        private val build by lazy @TargetApi(30) { classBuilder.getDeclaredMethod("build") }
         @get:RequiresApi(30)
-        private val setAllowedClientList by lazy {
+        private val setAllowedClientList by lazy @TargetApi(30) {
             classBuilder.getDeclaredMethod("setAllowedClientList", java.util.List::class.java)
         }
         @get:RequiresApi(30)
-        private val setAutoShutdownEnabled by lazy {
+        private val setAutoShutdownEnabled by lazy @TargetApi(30) {
             classBuilder.getDeclaredMethod("setAutoShutdownEnabled", Boolean::class.java)
         }
         @get:RequiresApi(30)
-        private val setBand by lazy { classBuilder.getDeclaredMethod("setBand", Int::class.java) }
+        private val setBand by lazy @TargetApi(30) { classBuilder.getDeclaredMethod("setBand", Int::class.java) }
         @get:RequiresApi(30)
-        private val setBlockedClientList by lazy {
+        private val setBlockedClientList by lazy @TargetApi(30) {
             classBuilder.getDeclaredMethod("setBlockedClientList", java.util.List::class.java)
         }
         @get:RequiresApi(31)
-        private val setBridgedModeOpportunisticShutdownEnabled by lazy {
+        private val setBridgedModeOpportunisticShutdownEnabled by lazy @TargetApi(31) {
             classBuilder.getDeclaredMethod("setBridgedModeOpportunisticShutdownEnabled", Boolean::class.java)
         }
         @get:RequiresApi(30)
@@ -235,41 +234,43 @@ data class SoftApConfigurationCompat(
             classBuilder.getDeclaredMethod("setBssid", MacAddress::class.java)
         }
         @get:RequiresApi(30)
-        private val setChannel by lazy {
+        private val setChannel by lazy @TargetApi(30) {
             classBuilder.getDeclaredMethod("setChannel", Int::class.java, Int::class.java)
         }
         @get:RequiresApi(31)
-        private val setChannels by lazy {
+        private val setChannels by lazy @TargetApi(31) {
             classBuilder.getDeclaredMethod("setChannels", SparseIntArray::class.java)
         }
         @get:RequiresApi(30)
-        private val setClientControlByUserEnabled by lazy {
+        private val setClientControlByUserEnabled by lazy @TargetApi(30) {
             classBuilder.getDeclaredMethod("setClientControlByUserEnabled", Boolean::class.java)
         }
         @get:RequiresApi(30)
-        private val setHiddenSsid by lazy { classBuilder.getDeclaredMethod("setHiddenSsid", Boolean::class.java) }
+        private val setHiddenSsid by lazy @TargetApi(30) {
+            classBuilder.getDeclaredMethod("setHiddenSsid", Boolean::class.java)
+        }
         @get:RequiresApi(31)
-        private val setIeee80211axEnabled by lazy {
+        private val setIeee80211axEnabled by lazy @TargetApi(31) {
             classBuilder.getDeclaredMethod("setIeee80211axEnabled", Boolean::class.java)
         }
         @get:RequiresApi(31)
-        private val setMacRandomizationSetting by lazy {
+        private val setMacRandomizationSetting by lazy @TargetApi(31) {
             classBuilder.getDeclaredMethod("setMacRandomizationSetting", Int::class.java)
         }
         @get:RequiresApi(30)
-        private val setMaxNumberOfClients by lazy {
+        private val setMaxNumberOfClients by lazy @TargetApi(31) {
             classBuilder.getDeclaredMethod("setMaxNumberOfClients", Int::class.java)
         }
         @get:RequiresApi(30)
-        private val setPassphrase by lazy {
+        private val setPassphrase by lazy @TargetApi(30) {
             classBuilder.getDeclaredMethod("setPassphrase", String::class.java, Int::class.java)
         }
         @get:RequiresApi(30)
-        private val setShutdownTimeoutMillis by lazy {
+        private val setShutdownTimeoutMillis by lazy @TargetApi(30) {
             classBuilder.getDeclaredMethod("setShutdownTimeoutMillis", Long::class.java)
         }
         @get:RequiresApi(30)
-        private val setSsid by lazy { classBuilder.getDeclaredMethod("setSsid", String::class.java) }
+        private val setSsid by lazy @TargetApi(30) { classBuilder.getDeclaredMethod("setSsid", String::class.java) }
         @get:RequiresApi(31)
         private val setUserConfiguration by lazy @TargetApi(31) { UnblockCentral.setUserConfiguration(classBuilder) }
 
@@ -350,7 +351,7 @@ data class SoftApConfigurationCompat(
             if (channel == 0) setBand(builder, band) else setChannel(builder, channel, band)
         } else setChannels(builder, channels)
         @get:RequiresApi(30)
-        private val staticBuilder by lazy { classBuilder.newInstance() }
+        private val staticBuilder by lazy @TargetApi(30) { classBuilder.newInstance() }
         @RequiresApi(30)
         fun testPlatformValidity(channels: SparseIntArray) = setChannelsCompat(staticBuilder, channels)
         @RequiresApi(30)
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt
index 084d683a..e06b247b 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt
@@ -64,7 +64,6 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
                     channels2G + (15..165).map { ChannelOption(SoftApConfigurationCompat.BAND_5GHZ, it) }
         }
         private val p2pSafeOptions by lazy { genAutoOptions(SoftApConfigurationCompat.BAND_LEGACY) + channels5G }
-        @get:RequiresApi(30)
         private val softApOptions by lazy {
             when (Build.VERSION.SDK_INT) {
                 in 30..Int.MAX_VALUE -> {
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/preference/UpstreamsPreference.kt b/mobile/src/main/java/be/mygod/vpnhotspot/preference/UpstreamsPreference.kt
index d826d161..a66efd51 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/preference/UpstreamsPreference.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/preference/UpstreamsPreference.kt
@@ -31,7 +31,7 @@ class UpstreamsPreference(context: Context, attrs: AttributeSet) : Preference(co
             if (internet) SpannableStringBuilder(ifname).apply {
                 setSpan(StyleSpan(Typeface.BOLD), 0, length, 0)
             } else ifname
-        }.joinTo(SpannableStringBuilder()).let { if (it.isEmpty()) "∅" else it }
+        }.joinTo(SpannableStringBuilder()).ifEmpty { "∅" }
 
         override fun onAvailable(properties: LinkProperties?) {
             val result = mutableMapOf<String, Boolean>()