diff --git a/java_console/shared_io/src/main/java/com/rusefi/rusEFIVersion.java b/java_console/shared_io/src/main/java/com/rusefi/rusEFIVersion.java
index d2692e536e..e1ec3e91b0 100644
--- a/java_console/shared_io/src/main/java/com/rusefi/rusEFIVersion.java
+++ b/java_console/shared_io/src/main/java/com/rusefi/rusEFIVersion.java
@@ -6,7 +6,7 @@ import java.net.URL;
 import java.util.concurrent.atomic.AtomicReference;
 
 public class rusEFIVersion {
-    public static final int CONSOLE_VERSION = 20211022;
+    public static final int CONSOLE_VERSION = 20211023;
     public static AtomicReference<String> firmwareVersion = new AtomicReference<>("N/A");
 
     public static long classBuildTimeMillis() {
diff --git a/java_console/ui/src/main/java/com/rusefi/maintenance/DfuFlasher.java b/java_console/ui/src/main/java/com/rusefi/maintenance/DfuFlasher.java
index ad8e231969..ef2e86a697 100644
--- a/java_console/ui/src/main/java/com/rusefi/maintenance/DfuFlasher.java
+++ b/java_console/ui/src/main/java/com/rusefi/maintenance/DfuFlasher.java
@@ -102,11 +102,17 @@ public class DfuFlasher {
         if (stdout.toString().contains("Download verified successfully")) {
             // looks like sometimes we are not catching the last line of the response? 'Upgrade' happens before 'Verify'
             wnd.appendMsg("SUCCESS!");
+            wnd.appendMsg("Please power cycle device to exit DFU mode");
+        } else if (stdout.toString().contains("Target device not found")) {
+            wnd.appendMsg("ERROR: Device not connected or STM32 Bootloader driver not installed?");
+            wnd.appendMsg("ERROR: Please try installing drivers using 'Install Drivers' button on rusEFI splash screen");
+            wnd.appendMsg("ERROR: Alternatively please install drivers manually from 'drivers/silent_st_drivers/DFU_Driver' folder");
+            wnd.setErrorState(true);
         } else {
             wnd.appendMsg(stdout.length() + " / " + errorResponse.length());
             wnd.appendMsg("ERROR: does not look like DFU has worked!");
+            wnd.setErrorState(true);
         }
-        wnd.appendMsg("Please power cycle device to exit DFU mode");
     }
 
     private static void timeForDfuSwitch(StatusWindow wnd) {
diff --git a/java_console/ui/src/main/java/com/rusefi/ui/StatusWindow.java b/java_console/ui/src/main/java/com/rusefi/ui/StatusWindow.java
index 961b378ac1..1fefe8afec 100644
--- a/java_console/ui/src/main/java/com/rusefi/ui/StatusWindow.java
+++ b/java_console/ui/src/main/java/com/rusefi/ui/StatusWindow.java
@@ -13,6 +13,8 @@ import java.awt.*;
  * 3/7/2015
  */
 public class StatusWindow implements StatusConsumer {
+    private static final Color LIGHT_RED = new Color(255, 102, 102);
+    private static final Color LIGHT_GREEN = new Color(102, 255 ,102);
     // todo: extract driver from console bundle? find a separate driver bundle?
     private final JTextArea logTextArea = new JTextArea();
     private final JPanel content = new JPanel(new BorderLayout());
@@ -41,6 +43,14 @@ public class StatusWindow implements StatusConsumer {
         return content;
     }
 
+    public void setErrorState(boolean isErrorState) {
+        if (isErrorState) {
+            logTextArea.setBackground(LIGHT_RED);
+        } else {
+            logTextArea.setBackground(LIGHT_GREEN);
+        }
+    }
+
     public JFrame getFrame() {
         return frameHelper.getFrame();
     }
@@ -55,7 +65,7 @@ public class StatusWindow implements StatusConsumer {
     @Override
     public void appendMsg(final String string) {
         SwingUtilities.invokeLater(() -> {
-            String s = string.replaceAll(Character.toString((char)219), "");
+            String s = string.replaceAll(Character.toString((char) 219), "");
             FileLog.MAIN.logLine(s);
             logTextArea.append(s + "\r\n");
             UiUtils.trueLayout(logTextArea);