diff --git a/java_console/ui/src/com/rusefi/maintenance/DfuFlasher.java b/java_console/ui/src/com/rusefi/maintenance/DfuFlasher.java
index cd3316ace5..615d8c3d12 100644
--- a/java_console/ui/src/com/rusefi/maintenance/DfuFlasher.java
+++ b/java_console/ui/src/com/rusefi/maintenance/DfuFlasher.java
@@ -71,9 +71,16 @@ public class DfuFlasher {
         } catch (InterruptedException e) {
             throw new IllegalStateException(e);
         }
-        ExecHelper.executeCommand(FirmwareFlasher.BINARY_LOCATION,
+        StringBuffer stdout = new StringBuffer();
+        String errorResponse = ExecHelper.executeCommand(FirmwareFlasher.BINARY_LOCATION,
                 FirmwareFlasher.BINARY_LOCATION + File.separator + DFU_COMMAND,
-                DFU_BINARY, wnd);
+                DFU_BINARY, wnd, stdout);
+        if (stdout.toString().contains("Verify successful")) {
+            wnd.appendMsg("SUCCESS!");
+        } else {
+            wnd.appendMsg(stdout.length() + " / " + errorResponse.length());
+            wnd.appendMsg("ERROR: does not look like DFU has worked!");
+        }
         wnd.appendMsg("Please power cycle device to exit DFU mode");
     }
 
diff --git a/java_console/ui/src/com/rusefi/maintenance/ExecHelper.java b/java_console/ui/src/com/rusefi/maintenance/ExecHelper.java
index 0e76b8063b..9785930ee3 100644
--- a/java_console/ui/src/com/rusefi/maintenance/ExecHelper.java
+++ b/java_console/ui/src/com/rusefi/maintenance/ExecHelper.java
@@ -43,16 +43,24 @@ public class ExecHelper {
     }
 
     @NotNull
-    public static StringBuffer executeCommand(String workingDirPath, String command, String binaryRelativeName, StatusConsumer wnd) {
+    public static String executeCommand(String workingDirPath, String command, String binaryRelativeName, StatusConsumer wnd) {
+        return executeCommand(workingDirPath, command, binaryRelativeName, wnd, new StringBuffer());
+    }
+
+        /**
+         * @param output out parameter with stdout content
+         * @return stderr of invoked command
+         */
+    @NotNull
+    public static String executeCommand(String workingDirPath, String command, String binaryRelativeName, StatusConsumer wnd, StringBuffer output) {
         StringBuffer error = new StringBuffer();
         String binaryFullName = workingDirPath + File.separator + binaryRelativeName;
         if (!new File(binaryFullName).exists()) {
             wnd.appendMsg(binaryFullName + " not found :(");
-            return error;
+            return error.toString();
         }
 
         wnd.appendMsg("Executing " + command);
-        StringBuffer output = new StringBuffer();
         try {
             File workingDir = new File(workingDirPath);
             Process p = Runtime.getRuntime().exec(command, null, workingDir);
@@ -65,7 +73,7 @@ public class ExecHelper {
             wnd.appendMsg("WaitError: " + e);
         }
         wnd.appendMsg("Done!");
-        return error;
+        return error.toString();
     }
 
     protected static void submitAction(Runnable runnable, String threadName) {
diff --git a/java_console/ui/src/com/rusefi/maintenance/FirmwareFlasher.java b/java_console/ui/src/com/rusefi/maintenance/FirmwareFlasher.java
index 3d7c70dd64..4131c8989b 100644
--- a/java_console/ui/src/com/rusefi/maintenance/FirmwareFlasher.java
+++ b/java_console/ui/src/com/rusefi/maintenance/FirmwareFlasher.java
@@ -61,7 +61,7 @@ public class FirmwareFlasher {
         return OPENOCD_EXE + " -f openocd/" + cfg;
     }
 
-    protected static StringBuffer executeOpenOCDCommand(String command, StatusWindow wnd) {
+    protected static String executeOpenOCDCommand(String command, StatusWindow wnd) {
         return ExecHelper.executeCommand(BINARY_LOCATION,
                 BINARY_LOCATION + File.separator + command,
                 OPENOCD_EXE, wnd);
@@ -74,12 +74,12 @@ public class FirmwareFlasher {
             return;
         }
         StatusAnimation sa = new StatusAnimation(wnd);
-        StringBuffer error = executeOpenOCDCommand(getOpenocdCommand() + " -c \"program " +
+        String error = executeOpenOCDCommand(getOpenocdCommand() + " -c \"program " +
                 fileName +
                 " verify reset exit 0x08000000\"", wnd);
-        if (error.toString().contains(NO_DRIVER_MESSAGE_TAG)) {
+        if (error.contains(NO_DRIVER_MESSAGE_TAG)) {
             wnd.appendMsg(" !!! ERROR: looks like stm32 driver is not installed? The link is above !!!");
-        } else if (error.toString().contains(SUCCESS_MESSAGE_TAG) && !error.toString().toLowerCase().contains(FAILED_MESSAGE_TAG)) {
+        } else if (error.contains(SUCCESS_MESSAGE_TAG) && !error.toLowerCase().contains(FAILED_MESSAGE_TAG)) {
             wnd.appendMsg("Flashing looks good!");
             sa.stop();
             wnd.setStatus(DONE);