diff --git a/source/ChanSort.Loader.Unsupported/ChanSort.Loader.Unsupported.csproj b/source/ChanSort.Loader.Unsupported/ChanSort.Loader.Unsupported.csproj
new file mode 100644
index 0000000..d04fbb4
--- /dev/null
+++ b/source/ChanSort.Loader.Unsupported/ChanSort.Loader.Unsupported.csproj
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>ChanSort.Loader.Unsupported</RootNamespace>
+    <AssemblyName>ChanSort.Loader.Unsupported</AssemblyName>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="UnsupportedPlugin.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\ChanSort.Api\ChanSort.Api.csproj">
+      <Project>{dccffa08-472b-4d17-bb90-8f513fc01392}</Project>
+      <Name>ChanSort.Api</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>
\ No newline at end of file
diff --git a/source/ChanSort.Loader.Unsupported/Properties/AssemblyInfo.cs b/source/ChanSort.Loader.Unsupported/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..7416181
--- /dev/null
+++ b/source/ChanSort.Loader.Unsupported/Properties/AssemblyInfo.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("ChanSort.Loader.Unsupported")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("ChanSort.Loader.Unsupported")]
+[assembly: AssemblyCopyright("Copyright ©  2022")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("d7c32dae-5d77-46a0-bc16-c95d9c7efdd5")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/source/ChanSort.Loader.Unsupported/UnsupportedPlugin.cs b/source/ChanSort.Loader.Unsupported/UnsupportedPlugin.cs
new file mode 100644
index 0000000..5283003
--- /dev/null
+++ b/source/ChanSort.Loader.Unsupported/UnsupportedPlugin.cs
@@ -0,0 +1,72 @@
+using System.IO;
+using System.Linq;
+using ChanSort.Api;
+
+namespace ChanSort.Loader.Unsupported
+{
+  // This Loader handles known unsupported file formats and informs users about the fact and that there is probably no need to ask for adding support
+
+  public class UnsupportedPlugin : ISerializerPlugin
+  {
+    public string DllName { get; set; }
+    public string PluginName => "Unsupported";
+    public string FileFilter => "*";
+
+    private string dir;
+    private string name;
+    private string ext;
+
+    public SerializerBase CreateSerializer(string inputFile)
+    {
+      dir = Path.GetDirectoryName(inputFile);
+      name = Path.GetFileName(inputFile).ToLowerInvariant();
+      ext = Path.GetExtension(name);
+
+      CheckForMediaTekAndroidBin();
+      CheckForVestelEncryptedDb();
+      
+      throw LoaderException.TryNext("File is not on the list of explicitly unsupported formats");
+    }
+
+    #region CheckForMediaTekAndroidBin()
+    /// <summary>
+    /// Many different TV brands seem to use the same underlying hardware/firmware platform for their Android models.
+    /// It is unclear how much the brands can customize the exported TV list, but many seem to use the default.
+    /// In that configuration there is a .bin file, a .bin.crc, a .xml file and often a _sub.bin file on the USB stick.
+    /// The .bin is a compressed archive with undocumented compression algorithm and file format.
+    /// The .bin.crc does not use any of the standard CRC32 configurations.
+    /// The .xml is contains only rudimentary and crippled data, that makes it useless.
+    ///
+    /// Known manufacturers using such lists: Grundig, Nokia, Panasonic, Philips, Sharp, Xiaomi
+    /// </summary>
+    private void CheckForMediaTekAndroidBin()
+    {
+      if (ext == ".bin" || ext == ".xml" || ext == ".crc")
+      {
+        var fname = Path.GetFileNameWithoutExtension(name);
+        if (fname.EndsWith("_sub"))
+          fname = fname.Substring(0, fname.Length - 4);
+        var checkExt = new[] { ".bin", ".bin.crc", ".xml" };
+        var hasAll = checkExt.All(ce => File.Exists(Path.Combine(dir, fname + ce)));
+        if (hasAll)
+          throw LoaderException.Fail(
+            @"Encrypted MediaTek Android channel lists (used by many TV brands) can't be read/modified with ChanSort.");
+      }
+    }
+    #endregion
+
+    #region CheckForVestelEncryptedDb
+    /// <summary>
+    /// At some point Vestel firmware started to export encrypted settingsDB_enc.db instead of settingsDB.db.
+    /// This seems to have affected many brands using the Vestel platform without their knowledge, including
+    /// Panasonic, Nabo, Toshiba
+    /// </summary>
+    private void CheckForVestelEncryptedDb()
+    {
+      if (name.EndsWith("_enc") && ext == ".db")
+        throw LoaderException.Fail(@"Encrypted Vestel channel lists (used by many TV brands) can't be read/modified with ChanSort.");
+    }
+    #endregion
+
+  }
+}
diff --git a/source/ChanSort.sln b/source/ChanSort.sln
index d35a418..e7bfe65 100644
--- a/source/ChanSort.sln
+++ b/source/ChanSort.sln
@@ -98,6 +98,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ChanSort.Loader.Loewe", "Ch
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Test.Loader.CmdbBin", "Test.Loader.CmdbBin\Test.Loader.CmdbBin.csproj", "{3B7C25DF-645B-4ACF-8528-27EF40FAF91F}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ChanSort.Loader.Unsupported", "ChanSort.Loader.Unsupported\ChanSort.Loader.Unsupported.csproj", "{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		All_Debug|Any CPU = All_Debug|Any CPU
@@ -1195,6 +1197,36 @@ Global
 		{3B7C25DF-645B-4ACF-8528-27EF40FAF91F}.Release|Mixed Platforms.Build.0 = Release|Any CPU
 		{3B7C25DF-645B-4ACF-8528-27EF40FAF91F}.Release|x86.ActiveCfg = Release|Any CPU
 		{3B7C25DF-645B-4ACF-8528-27EF40FAF91F}.Release|x86.Build.0 = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Debug|Mixed Platforms.Build.0 = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Debug|x86.ActiveCfg = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Debug|x86.Build.0 = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Release|Any CPU.Build.0 = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Release|Mixed Platforms.ActiveCfg = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Release|Mixed Platforms.Build.0 = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Release|x86.ActiveCfg = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.All_Release|x86.Build.0 = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Debug|x86.Build.0 = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.NoDevExpress_Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.NoDevExpress_Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.NoDevExpress_Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.NoDevExpress_Debug|Mixed Platforms.Build.0 = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.NoDevExpress_Debug|x86.ActiveCfg = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.NoDevExpress_Debug|x86.Build.0 = Debug|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Release|Mixed Platforms.Build.0 = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Release|x86.ActiveCfg = Release|Any CPU
+		{D7C32DAE-5D77-46A0-BC16-C95D9C7EFDD5}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/source/ChanSort/ChanSort.csproj b/source/ChanSort/ChanSort.csproj
index 22fc654..c700bc7 100644
--- a/source/ChanSort/ChanSort.csproj
+++ b/source/ChanSort/ChanSort.csproj
@@ -594,6 +594,10 @@
       <Project>{f6f02792-07f1-48d5-9af3-f945ca5e3931}</Project>
       <Name>ChanSort.Loader.Toshiba</Name>
     </ProjectReference>
+    <ProjectReference Include="..\ChanSort.Loader.Unsupported\ChanSort.Loader.Unsupported.csproj">
+      <Project>{d7c32dae-5d77-46a0-bc16-c95d9c7efdd5}</Project>
+      <Name>ChanSort.Loader.Unsupported</Name>
+    </ProjectReference>
     <ProjectReference Include="..\ChanSort.Loader.VDR\ChanSort.Loader.VDR.csproj">
       <Project>{74a18c6f-09ff-413e-90d9-827066fa5b36}</Project>
       <Name>ChanSort.Loader.VDR</Name>
diff --git a/source/ChanSort/MainForm.cs b/source/ChanSort/MainForm.cs
index e4753ee..fe7a79f 100644
--- a/source/ChanSort/MainForm.cs
+++ b/source/ChanSort/MainForm.cs
@@ -648,6 +648,7 @@ namespace ChanSort.Ui
       this.currentPlugin = plugin;
       this.currentTvSerializer = serializer;
       this.DataRoot = serializer.DataRoot;
+      this.ApplyReadOnlyOverride();
       this.AddFileToMruList(serializer.FileName);
       this.UpdateMruMenu();
 
@@ -2210,7 +2211,16 @@ namespace ChanSort.Ui
     }
     #endregion
 
-    
+    #region ApplyReadOnlyOverride()
+    private void ApplyReadOnlyOverride()
+    {
+      if (this.miAllowEditPredefinedLists.Down)
+      {
+        foreach (var list in this.DataRoot.ChannelLists)
+          list.ReadOnly = false;
+      }
+    }
+    #endregion
 
     // UI events
 
@@ -3078,6 +3088,7 @@ namespace ChanSort.Ui
     {
       TryExecute(() =>
       {
+        this.ApplyReadOnlyOverride();
         this.UpdateGridReadOnly();
         this.UpdateMenu();
       });
diff --git a/source/changelog.md b/source/changelog.md
index 87be1d3..f26bf0b 100644
--- a/source/changelog.md
+++ b/source/changelog.md
@@ -1,6 +1,10 @@
 ChanSort Change Log 
 ===================
 
+TBA
+- fixed: menu "settings / allow editing predefined lists (DANGEROUS)" unlocked the edit functions
+  in the user interface, but changes to those lists were not saved to disk.
+
 2022-12-04
 - fixed: various .xml file formats could not be loaded anymore
 - channels can also be swapped now be directly selecting two rows and clicking on "swap"