diff --git a/WPinternals/Models/UEFIApps/LumiaFlashAppModel.cs b/WPinternals/Models/UEFIApps/LumiaFlashAppModel.cs
index 4e612a8..2c087e7 100644
--- a/WPinternals/Models/UEFIApps/LumiaFlashAppModel.cs
+++ b/WPinternals/Models/UEFIApps/LumiaFlashAppModel.cs
@@ -344,7 +344,8 @@ namespace WPinternals
             UInt16 Error = (UInt16)((Buffer[6] << 8) + Buffer[7]);
             if (Error > 0)
             {
-                throw new NotSupportedException("ReadGPT: Error 0x" + Error.ToString("X4"));
+                ThrowFlashError(Error);
+                //throw new NotSupportedException("ReadGPT: Error 0x" + Error.ToString("X4"));
             }
 
             System.Buffer.BlockCopy(Buffer, 8, GPTChunk, 0, 0x4400);
diff --git a/WPinternals/Models/UEFIApps/NokiaFlashModel.cs b/WPinternals/Models/UEFIApps/NokiaFlashModel.cs
index b1c0c3e..4906cc8 100644
--- a/WPinternals/Models/UEFIApps/NokiaFlashModel.cs
+++ b/WPinternals/Models/UEFIApps/NokiaFlashModel.cs
@@ -62,7 +62,7 @@ namespace WPinternals
             bool ModernFlashApp = info.VersionMajor >= 2;
 
             byte[] Request = new byte[7];
-            ByteOperations.WriteAsciiString(Request, 0, SwitchModeSignature + "B");
+            ByteOperations.WriteAsciiString(Request, 0, $"{SwitchModeSignature}B");
             byte[] Response = ExecuteRawMethod(Request);
             if (ByteOperations.ReadAsciiString(Response, 0, 4) == "NOKU")
             {
diff --git a/WPinternals/ViewModels/LumiaFlashRomViewModel.cs b/WPinternals/ViewModels/LumiaFlashRomViewModel.cs
index 686b30e..d5ca718 100644
--- a/WPinternals/ViewModels/LumiaFlashRomViewModel.cs
+++ b/WPinternals/ViewModels/LumiaFlashRomViewModel.cs
@@ -501,7 +501,7 @@ namespace WPinternals
 
         internal void FlashFFUTask(string FFUPath)
         {
-            new Thread(() =>
+            new Thread(async () =>
             {
                 bool Result = true;
 
@@ -519,8 +519,35 @@ namespace WPinternals
 
                 if (Info.FlashAppProtocolVersionMajor >= 2)
                 {
-                    byte[] GPTChunk = Phone.GetGptChunk(0x20000); // TODO: Get proper profile FFU and get ChunkSizeInBytes
+                    Phone.SwitchToBootManagerContext();
+
+                    if (PhoneNotifier.CurrentInterface != PhoneInterfaces.Lumia_Bootloader)
+                    {
+                        await PhoneNotifier.WaitForArrival();
+                    }
+
+                    if (PhoneNotifier.CurrentInterface != PhoneInterfaces.Lumia_Bootloader)
+                    {
+                        throw new WPinternalsException("Unexpected Mode");
+                    }
+
+                    byte[] GPTChunk = ((LumiaBootManagerAppModel)PhoneNotifier.CurrentModel).GetGptChunk(0x20000); // TODO: Get proper profile FFU and get ChunkSizeInBytes
                     GPT GPT = new(GPTChunk);
+
+                    ((LumiaBootManagerAppModel)PhoneNotifier.CurrentModel).SwitchToFlashAppContext();
+
+                    if (PhoneNotifier.CurrentInterface != PhoneInterfaces.Lumia_Flash)
+                    {
+                        await PhoneNotifier.WaitForArrival();
+                    }
+
+                    if (PhoneNotifier.CurrentInterface != PhoneInterfaces.Lumia_Flash)
+                    {
+                        throw new WPinternalsException("Unexpected Mode");
+                    }
+
+                    Phone = (LumiaFlashAppModel)PhoneNotifier.CurrentModel;
+
                     FlashPart Part;
                     List<FlashPart> FlashParts = new();
 
diff --git a/WPinternals/ViewModels/NokiaNormalViewModel.cs b/WPinternals/ViewModels/NokiaNormalViewModel.cs
index 47c532f..a6e29bb 100644
--- a/WPinternals/ViewModels/NokiaNormalViewModel.cs
+++ b/WPinternals/ViewModels/NokiaNormalViewModel.cs
@@ -67,17 +67,35 @@ namespace WPinternals
 
                 LogFile.Log("IMEI: " + IMEI);
                 PublicID = CurrentModel.ExecuteJsonMethodAsBytes("ReadPublicId", "PublicId"); // 0x14 bytes: a5 e5 ...
-                LogFile.Log("Public ID: " + Converter.ConvertHexToString(PublicID, " "));
+                if (PublicID != null)
+                {
+                    LogFile.Log("Public ID: " + Converter.ConvertHexToString(PublicID, " "));
+                }
                 BluetoothMac = CurrentModel.ExecuteJsonMethodAsBytes("ReadBtId", "BtId"); // 6 bytes: bc c6 ...
-                LogFile.Log("Bluetooth MAC: " + Converter.ConvertHexToString(BluetoothMac, " "));
+                if (BluetoothMac != null)
+                {
+                    LogFile.Log("Bluetooth MAC: " + Converter.ConvertHexToString(BluetoothMac, " "));
+                }
                 WlanMac1 = CurrentModel.ExecuteJsonMethodAsBytes("ReadWlanMacAddress", "WlanMacAddress1"); // 6 bytes
-                LogFile.Log("WLAN MAC 1: " + Converter.ConvertHexToString(WlanMac1, " "));
+                if (WlanMac1 != null)
+                {
+                    LogFile.Log("WLAN MAC 1: " + Converter.ConvertHexToString(WlanMac1, " "));
+                }
                 WlanMac2 = CurrentModel.ExecuteJsonMethodAsBytes("ReadWlanMacAddress", "WlanMacAddress2"); // 6 bytes
-                LogFile.Log("WLAN MAC 2: " + Converter.ConvertHexToString(WlanMac2, " "));
+                if (WlanMac2 != null)
+                {
+                    LogFile.Log("WLAN MAC 2: " + Converter.ConvertHexToString(WlanMac2, " "));
+                }
                 WlanMac3 = CurrentModel.ExecuteJsonMethodAsBytes("ReadWlanMacAddress", "WlanMacAddress3"); // 6 bytes
-                LogFile.Log("WLAN MAC 3: " + Converter.ConvertHexToString(WlanMac3, " "));
+                if (WlanMac3 != null)
+                {
+                    LogFile.Log("WLAN MAC 3: " + Converter.ConvertHexToString(WlanMac3, " "));
+                }
                 WlanMac4 = CurrentModel.ExecuteJsonMethodAsBytes("ReadWlanMacAddress", "WlanMacAddress4"); // 6 bytes
-                LogFile.Log("WLAN MAC 4: " + Converter.ConvertHexToString(WlanMac4, " "));
+                if (WlanMac4 != null)
+                {
+                    LogFile.Log("WLAN MAC 4: " + Converter.ConvertHexToString(WlanMac4, " "));
+                }
 
                 bool? ProductionDone = CurrentModel.ExecuteJsonMethodAsBoolean("ReadProductionDoneState", "ProductionDone");
                 IsBootloaderSecurityEnabled = ProductionDone == null