diff --git a/src/main/java/com/rusefi/dfu/DfuConnectionUtil.java b/src/main/java/com/rusefi/dfu/DfuConnectionUtil.java
index db6489e..e4102e1 100644
--- a/src/main/java/com/rusefi/dfu/DfuConnectionUtil.java
+++ b/src/main/java/com/rusefi/dfu/DfuConnectionUtil.java
@@ -10,8 +10,9 @@ public class DfuConnectionUtil {
         while (state.getState() == DfuCommandGetStatus.State.DFU_DOWNLOAD_BUSY || state.getState() == DfuCommandGetStatus.State.DFU_ERROR) {
             state = DfuCommandGetStatus.read(logger, device);
             logger.info("Loop state " + state);
-            if (System.currentTimeMillis() - enter > 10 * DfuConnection.SECOND)
-                throw new IllegalStateException("State does not look good");
+            long durationMs = System.currentTimeMillis() - enter;
+            if (durationMs > 10 * DfuConnection.SECOND)
+                throw new IllegalStateException("State does not look good after " + durationMs + "ms, still " + state);
         }
     }