diff --git a/nanoFirmwareFlasher.Library/JLinkCli.cs b/nanoFirmwareFlasher.Library/JLinkCli.cs
index 3a1b8503..d2453f85 100644
--- a/nanoFirmwareFlasher.Library/JLinkCli.cs
+++ b/nanoFirmwareFlasher.Library/JLinkCli.cs
@@ -280,47 +280,18 @@ public ExitCodes ExecuteFlashBinFiles(
 
             Console.ForegroundColor = ConsoleColor.White;
 
-            return ExitCodes.OK;
-        }
-
-        private ExitCodes ProcessFilePaths(IList<string> files, List<string> shadowFiles)
-        {
-            // J-Link can't handle diacritc chars
-            // developer note: reported to Segger (Case: 60276735) and can be removed if this is fixed/improved
-            foreach (string binFile in files)
+            // be nice and clean up shadow files
+            try
             {
-                // make sure path is absolute
-                var binFilePath = Utilities.MakePathAbsolute(
-                    Environment.CurrentDirectory,
-                    binFile);
-
-                // check file existence
-                if (!File.Exists(binFilePath))
+                foreach (string shadowFile in shadowFiles)
                 {
-                    return ExitCodes.E5004;
-                }
-
-                if (!binFilePath.IsNormalized(NormalizationForm.FormD)
-                    || binFilePath.Contains(' '))
-                {
-                    var tempFile = Path.Combine(
-                        Environment.GetEnvironmentVariable("TEMP", EnvironmentVariableTarget.Machine),
-                        Path.GetFileName(binFilePath));
-
-                    // copy file to shadow file
-                    File.Copy(
-                        binFilePath,
-                        tempFile,
-                        true);
-
-                    shadowFiles.Add(tempFile);
-                }
-                else
-                {
-                    // copy file to shadow list
-                    shadowFiles.Add(binFile);
+                    File.Delete(shadowFile);
                 }
             }
+            catch (Exception)
+            {
+                // ignore any exception here
+            }
 
             return ExitCodes.OK;
         }
@@ -450,10 +421,23 @@ public ExitCodes ExecuteFlashHexFiles(
 
             Console.ForegroundColor = ConsoleColor.White;
 
+            // be nice and clean up shadow files
+            try
+            {
+                foreach (string shadowFile in shadowFiles)
+                {
+                    File.Delete(shadowFile);
+                }
+            }
+            catch (Exception)
+            {
+                // ignore any exception here
+            }
+
             return ExitCodes.OK;
         }
 
-        public void ShowCLIOutput(string cliOutput)
+        internal void ShowCLIOutput(string cliOutput)
         {
             // show CLI output, if verbosity is diagnostic
             if (Verbosity == VerbosityLevel.Diagnostic)
@@ -536,5 +520,47 @@ internal static string RunJLinkCLI(string cmdFile, string arguments = null)
 
             return jlinkCli.StandardOutput.ReadToEnd();
         }
+
+        private ExitCodes ProcessFilePaths(IList<string> files, List<string> shadowFiles)
+        {
+            // J-Link can't handle diacritc chars
+            // developer note: reported to Segger (Case: 60276735) and can be removed if this is fixed/improved
+            foreach (string binFile in files)
+            {
+                // make sure path is absolute
+                var binFilePath = Utilities.MakePathAbsolute(
+                    Environment.CurrentDirectory,
+                    binFile);
+
+                // check file existence
+                if (!File.Exists(binFilePath))
+                {
+                    return ExitCodes.E5004;
+                }
+
+                if (!binFilePath.IsNormalized(NormalizationForm.FormD)
+                    || binFilePath.Contains(' '))
+                {
+                    var tempFile = Path.Combine(
+                        Environment.GetEnvironmentVariable("TEMP", EnvironmentVariableTarget.Machine),
+                        Path.GetFileName(binFilePath));
+
+                    // copy file to shadow file
+                    File.Copy(
+                        binFilePath,
+                        tempFile,
+                        true);
+
+                    shadowFiles.Add(tempFile);
+                }
+                else
+                {
+                    // copy file to shadow list
+                    shadowFiles.Add(binFilePath);
+                }
+            }
+
+            return ExitCodes.OK;
+        }
     }
 }