diff --git a/java_console/io/src/main/java/com/rusefi/proxy/NetworkConnector.java b/java_console/io/src/main/java/com/rusefi/proxy/NetworkConnector.java
index 52dcbabed3..10c8b4d675 100644
--- a/java_console/io/src/main/java/com/rusefi/proxy/NetworkConnector.java
+++ b/java_console/io/src/main/java/com/rusefi/proxy/NetworkConnector.java
@@ -40,7 +40,12 @@ public class NetworkConnector implements Closeable {
     private boolean isClosed;
 
     public NetworkConnectorResult start(Implementation implementation, String authToken, String controllerPort, NetworkConnectorContext context) {
-        return start(implementation, authToken, controllerPort, context, ReconnectListener.VOID);
+        return start(implementation, authToken, controllerPort, context, new ReconnectListener() {
+            @Override
+            public void onReconnect() {
+                log.info("onReconnect");
+            }
+        });
     }
 
     public NetworkConnectorResult start(Implementation implementation, String authToken, String controllerPort, NetworkConnectorContext context, ReconnectListener reconnectListener) {
diff --git a/java_console/io/src/main/java/com/rusefi/proxy/NetworkConnectorContext.java b/java_console/io/src/main/java/com/rusefi/proxy/NetworkConnectorContext.java
index fd35cb90b6..9ff8c7ef34 100644
--- a/java_console/io/src/main/java/com/rusefi/proxy/NetworkConnectorContext.java
+++ b/java_console/io/src/main/java/com/rusefi/proxy/NetworkConnectorContext.java
@@ -10,7 +10,7 @@ import static com.devexperts.logging.Logging.getLogging;
 public class NetworkConnectorContext {
     private static final Logging log = getLogging(NetworkConnectorContext.class);
     private static final int UPDATE_SBC_EXIT_CODE = 15;
-    private static final int UPDATE_FIRMWARE_EXIT_CODE = 16;
+    public static final int UPDATE_FIRMWARE_EXIT_CODE = 16;
 
     public int reconnectDelay() {
         return 15; // this one is seconds
diff --git a/java_console/io/src/main/java/com/rusefi/proxy/client/IncompatibleBackendException.java b/java_console/io/src/main/java/com/rusefi/proxy/client/IncompatibleBackendException.java
new file mode 100644
index 0000000000..02cbc16c88
--- /dev/null
+++ b/java_console/io/src/main/java/com/rusefi/proxy/client/IncompatibleBackendException.java
@@ -0,0 +1,9 @@
+package com.rusefi.proxy.client;
+
+import java.io.IOException;
+
+public class IncompatibleBackendException extends IOException {
+    public IncompatibleBackendException(String message) {
+        super(message);
+    }
+}
diff --git a/java_console/io/src/main/java/com/rusefi/proxy/client/LocalApplicationProxy.java b/java_console/io/src/main/java/com/rusefi/proxy/client/LocalApplicationProxy.java
index 6016b9c969..f42cf46e04 100644
--- a/java_console/io/src/main/java/com/rusefi/proxy/client/LocalApplicationProxy.java
+++ b/java_console/io/src/main/java/com/rusefi/proxy/client/LocalApplicationProxy.java
@@ -12,6 +12,7 @@ import com.rusefi.io.tcp.BinaryProtocolProxy;
 import com.rusefi.io.tcp.ServerSocketReference;
 import com.rusefi.io.tcp.TcpIoStream;
 import com.rusefi.proxy.NetworkConnector;
+import com.rusefi.proxy.NetworkConnectorContext;
 import com.rusefi.server.ApplicationRequest;
 import com.rusefi.server.rusEFISSLContext;
 import com.rusefi.tools.online.HttpUtil;
@@ -77,8 +78,15 @@ public class LocalApplicationProxy implements Closeable {
     public static ServerSocketReference startAndRun(LocalApplicationProxyContext context, ApplicationRequest applicationRequest, int jsonHttpPort, TcpIoStream.DisconnectListener disconnectListener, ConnectionListener connectionListener) throws IOException {
         String version = context.executeGet(ProxyClient.getHttpAddress(jsonHttpPort) + ProxyClient.VERSION_PATH);
         log.info("Server says version=" + version);
-        if (!version.contains(ProxyClient.BACKEND_VERSION))
-            throw new IOException("Unexpected backend version " + version + " while we want " + ProxyClient.BACKEND_VERSION);
+        if (!version.contains(ProxyClient.BACKEND_VERSION)) {
+            String message = "Unexpected backend version " + version + " while we want " + ProxyClient.BACKEND_VERSION;
+            log.error(message);
+            System.out.println(message);
+            /**
+             * let's give wrapper script a chance to update us
+             */
+            throw new IncompatibleBackendException(message);
+        }
 
         AbstractIoStream authenticatorToProxyStream = new TcpIoStream("authenticatorToProxyStream ", rusEFISSLContext.getSSLSocket(HttpUtil.RUSEFI_PROXY_HOSTNAME, context.serverPortForRemoteApplications()), disconnectListener);
         LocalApplicationProxy.sendHello(authenticatorToProxyStream, applicationRequest);
diff --git a/java_console/ui/src/main/java/com/rusefi/tools/NetworkConnectorStartup.java b/java_console/ui/src/main/java/com/rusefi/tools/NetworkConnectorStartup.java
index 3a96dc5b64..f330135ec0 100644
--- a/java_console/ui/src/main/java/com/rusefi/tools/NetworkConnectorStartup.java
+++ b/java_console/ui/src/main/java/com/rusefi/tools/NetworkConnectorStartup.java
@@ -5,10 +5,15 @@ import com.rusefi.auth.AuthTokenUtil;
 import com.rusefi.autodetect.PortDetector;
 import com.rusefi.proxy.NetworkConnector;
 import com.rusefi.proxy.NetworkConnectorContext;
+import com.rusefi.tools.online.HttpUtil;
+import com.rusefi.tools.online.ProxyClient;
 import com.rusefi.ui.AuthTokenPanel;
 
+import java.io.IOException;
+
 public class NetworkConnectorStartup {
     private final static Logging log = Logging.getLogging(NetworkConnectorStartup.class);
+
     public static void start() {
         String authToken = AuthTokenPanel.getAuthToken();
         if (!AuthTokenUtil.isToken(authToken)) {
@@ -24,8 +29,23 @@ public class NetworkConnectorStartup {
 
         NetworkConnectorContext connectorContext = new NetworkConnectorContext();
 
-        NetworkConnector.NetworkConnectorResult networkConnectorResult = new NetworkConnector().start(NetworkConnector.Implementation.SBC,
-                authToken, autoDetectedPort, connectorContext);
+        NetworkConnector.NetworkConnectorResult networkConnectorResult = new NetworkConnector().start(NetworkConnector.Implementation.SBC, authToken, autoDetectedPort, connectorContext, new NetworkConnector.ReconnectListener() {
+            @Override
+            public void onReconnect() {
+                try {
+                    String version = HttpUtil.executeGet(ProxyClient.getHttpAddress(HttpUtil.PROXY_JSON_API_HTTP_PORT) + ProxyClient.VERSION_PATH);
+                    if (!version.contains(ProxyClient.BACKEND_VERSION)) {
+                        String message = "Unexpected backend version " + version + " while we want " + ProxyClient.BACKEND_VERSION;
+                        log.error(message);
+                        System.out.println(message);
+                        // let's give wrapper bash script a chance to update software
+                        System.exit(NetworkConnectorContext.UPDATE_FIRMWARE_EXIT_CODE);
+                    }
+                } catch (IOException e) {
+                    log.error("Ignoring", e);
+                }
+            }
+        });
         log.info("Running with oneTimeToken=" + networkConnectorResult.getOneTimeToken());
     }
 }